Korean Dramas with Sibling Themes

Main plot. Brothers.

An elder brother's fierce love and protection for his younger brother who turns out not to be biological. The angsty scenes with the biological brother when this is revealed also give the feels. 

Main plot. Brothers.

Brothers separated when young. The elder brother goes looking for the younger one when he was under his nose all along. The elder's unconditional acceptance and protection of the younger give the feels.

Sub-plot. Twins.

The MC has a younger twin sister who he strives to protect from when he was a child and when they reunite. This is one central sub-plot in the show. 

Sub-plot. Brothers.

Elder brother feels responsible and guilt-ridden for his younger brother's disability and tries to support him in every way possible.

Main plot? Brothers.

The younger brother is the main caretaker and guardian of his older brother with autism.

Sub-plot. Brothers.

Jang Jun-woo is the psychopathic, abusive older brother of Jang Han-soo. Bromance scenes of Jang Han-soo with Vincenzo heal our hearts.   

Sub-plot. Siblings.

Hong Hae-in's typical, bickering relationship with her younger brother and her guilt towards her elder brother's death.  Baek Hyun-woo's relationship with his older siblings are fun to watch. The leads' interactions with their siblings-in-law are fun and heartwarming. 

Main plot. Brothers.

Lee Yeon travels back in time and meets his dead brother Lee Rang. Lots of angsty, heart-warming moments with the centuries-old Lee Rang still undergoing puberty. 

Sub-plot. Brothers.

The angst-ridden Lee Rang who feels his brother abandoned him and antagonises Lee Yeon at every turn. Kim Bum is magnificent and makes your heart ache for him.

Sub-plot. Siblings.

Kim Shin guilt and heartache towards his younger sister and Goryeon queen, Kim Sun. The siblings reunite in Kim Sun's reincarnation.  Bromance between Wang Yeo and Kim Shin.  

Main plot. Siblings.

In a step-family, the eldest stepbrother takes the fall for his younger brother's unintentional murder and is imprisoned for 8(?) years. Lots of angst, guilt and redemption. Some fluffy interaction. The female lead also has a heartwarming interactions with her female cousin. 

Sub-plot. Siblings.

In a step-family, the eldest brother dies and is falsely accused of murder. He finds himself waking up several years later and seeks his siblings out to support them, and attempting to undo the wrongs they faced over the years. 

Main plot. Brothers.

Elder brother goes looking for his brother who went missing years ago. Sci-fi plot.

Main plot. Brothers.

Younger brother literally travels time while searching for his older brother. Bromance with main lead.

Main plot. Sisters.

Not watched.

Sub-plot. Siblings.

A family drama with two generations of siblings and step-siblings.

Sub-plot. Siblings.

Leads come out of a cryogenic chamber 20 years late. The young ML's interactions with his much older younger siblings are funny and sad at the same time. The FL's interactions with her brother with autism are also heartwarming.

Sub-plot. Brothers.

Elder brother Lee Gun gets injured to save his younger brother Lee Shin, ending his tennis career. Later, he saves his brother and cares for him again despite his personal struggles.

I disliked the female lead and the romance sub-plot. I don't understand this fascination in Korean dramas with first loves in any case. 

Sub-plot. Brothers.

Many, many half-brothers. Heartwarming, playful interactions along with rivalries and jealousies. Some are quite tragic.

Sub-plot. Brothers.

ML and his elder brother share a healthy, affectionate relationship. Elder brother tries his best to prevent ML from losing out on his love, gives advice and supports him all the way. 

Sub-plot. Twins.

ML's children share an affectionate, playful relationship and are protective of each other.

Main plot. Siblings.

Family drama with several siblings and their romance lines.

Sub-plot. Siblings.

Not watched.

Main plot. Siblings.

Family drama with siblings and their love lines.

Sub-plot. Brothers.

Vigilante elder brother who pretends to be intellectually disabled while trying to avenge his father and younger brother who aligns with the enemy to get rid of hardships. Tragic. Melodrama.

Sub-plot. Brothers.

The Ki brothers are love. Separated by a family tragedy. Ha-myung becomes a reporter and looks for his elder brother. There's an emotional reunion and kind-of tragic aftermath. 

Minor plot. Brothers.

ML shares a good relationship with his happy-go-lucky, playful elder brother in his chaebol life. He plays the role of a caretaker and guardian to his younger brother in his office-servant life.

Minor plot. Brothers.

ML likes and looks up to his elder half-brother who spurns him at every turn, but later warms up to him.

Minor plot. Brothers.

ML and his elder brother share a contentious relationship. Rivals, even.

Sub-plot. Siblings.

FL takes on a parental role to her younger brother. 

Sub-plot. Siblings.

ML lives his older sister's shadow. They share a bickering but distant sibling relationship which improves over the course of the show. 

Sub-plot. Siblings.

Family drama, two sisters and a brother, each with their love lines.

Minor plot. Brothers.

FL's bias is ML's brother. Some scenes show their close relationship. 

Minor plot. Brothers/Siblings.

FL's adopted brother is loving and protective of her. ML has a distant relationship with his younger brother which later improves. He also has a younger step-sister with whom he shares a good relationship.  

Sub-plot. Brothers.

ML's elder brother is cold and distant to protect him from father's abuse and psychological torment. ML goes from hating him to feeling guilt, then getting closer to him. 

Sub-plot. Siblings.

Lee Ik-jun and Lee Ik-sun are a fun pair of siblings. The former may seem immature, but he straightens up as an older brother when the need arises. Ahn Jeong-wan has an older brother who is a priest - he provides counsel and listens to his drunken rambling frequently.

Main plot. Siblings.

Two brothers and a sister are separated when young and reunite as adults under different circumstances. Lots of melodrama and angst.

Didn't enjoy this very much.

Main plot. Brothers.

Brothers separated when young and reunite as adults under different circumstances. The only bright spot of this show was the scenes with Kim Jaejeong. 

Minor plot. Brothers.

ML is guardian to younger brother and cares for him deeply. Younger brother prompts him into action, motivating him to take the right path as a prosecutor.

Sub-plot. Sisters/Brothers.

FL has two foster sisters who live together. ML has a half-brother which is revealed later. But they have some warm and fuzzy scenes too. 

Sub-plot. Brothers/Siblings.

Namgoong Min's character and FL are step-siblings; he is also ML's adoptive brother. They share a good relationship though animosity arises halfway through. He loves him enough to rescue him from a fire.  

Sub-plot. Siblings.

FL and her brother are adoptive siblings. Brother is wary of ML and constantly protective of FL.

Minor plot. Sisters.

FL and SFL are sisters who share a love-hate relationship. Not watched the show fully.

Sub-plot. Brothers.

ML and SML are half-brothers. Their rivalry blossoms into friendship. SML is a rich, spoilt brat but his conscience prevails in the end.

Minor plot. Siblings.

Doctor Cha's son and daughter share a good relationship.

Main plot. Brothers.

Not watched.

Sub-plot. Siblings.

FL's best friend is ML's older sister.

Sub-plot. Brothers.

ML and SML are adoptive brothers with a bittersweet conclusion to their relationship.

Main plot. Brothers.

Brothers share a harmonious relationship. Many warm and fuzzy scenes with their respective love lines.

Sub-plot. Siblings.

A switched-at-birth story where ML and SFL are siblings. Melodrama and angst.

Sub-plot. Siblings.

The siblings share a good relationship. The Park brother's love-hate relationship with his step-brother also evolves over time. 

Sub-plot. Siblings.

FL searches for her missing brother with autism. 

Sub-plot. Brothers.

ML went missing as a child. Strikes a friendship with a man who he later knows is his younger male cousin whose uncle was responsible for his kidnapping.

Main plot. Brothers.

Ordinary, funny, lighthearted vignettes of two brothers who live together and the elder's girlfriend who later starts living with them.

Sub-plot. Brothers.

ML's older brother is devoted to his happiness. He makes desperate attempts to bring him out of the ghost's control.

Main plot. Siblings.

FL lives with two elder step-brothers and younger half-brother. They have funny, heartwarming and loving interactions.

Sub-plot. Brothers.

Not watched.

Sub-plot. Brothers.

FL and SML are best friends who fake an engagement, but ML falls for FL. ML and SML share a strained relationship which improves over time.

Minor plot. Siblings.

ML and his older sister share a good relationship. Watched this a while back, the memories are fuzzy.

Sub-plot. Siblings.

ML does everything possible to treat his sick younger sister. He's very protective and loving towards her.

Sub-plot. Brothers.

ML has a difficult childhood during which his elder brother was the only one who showed him kindness. ML transfers that affection to his niece after the brother's death. His interest towards the other ML is sparked by his resemblance to his older brother. The two male leads also have several bromance scenes.   

Main plot. Twins.

A cop (younger) twin and a ex-con (older) twin who goes great lengths to protect him.