A little different in the storyline, however:

Both of these dramas have a focus on sibling relationships.
Both of them are very heart-warming.
Both talk about finding love as the characters grow and develop through the episodes.
Both features lead actresses who are very positive and cheerful, and they overcome challenges life threw their way.

If you're into high fashion lead lady, with adorable rom com in the throw, this would be for you. Kono Etsuko is aspired to get hired into the fashion magazine she loves since she was young and was instead, being hired and assigned to the review team of the same company. But that doesn't stop her from showing her passion for fashion and for her work. It's truly a lovely and motivating series that i still love to this day

High fashion, working in a fashion magazine company. First class is more focused on the drama in the fashion magazine company rather than the love com though

Both about playing some sort of paychotic games to survive. Death Game Park is less visual but yet it has a gripping storyline.

Both about making use of what little time they've left in their life, and they discover love and dreams.

Taiyou no Uta might be a little more on the dream chasing part, it is a beautiful movie about hopes and dreams nonetheless, one of those heart warming drama as you follow the character's growth, and you discover precious things in life with them. Both lead are strong characters who works hard to fight for the time they have, to make something out of their lives.