This is one of the first dramas I've seen where I think the story felt undercut by the time travel conceit at the point that it happens or that it happens at all. There is so much powerful societal topics from the opening set up of the drama with Eun Gyeol family facing discrimination because of their disability, them being impoverished, Eun Gyeol's pressure to be the perfect from his family and himself, always having to be their voice, to be the pride his father can show off, his relationship with his older brother Eun Ho, Eun Ho as an athlete with an disability who is living a very eventful life outside of that as well, Eun Gyeol's love for music, his street smarts and book smarts, his parents tenacity to embrace the joy in their lives, etc. It's more like the beginning for a whole different show. Eun Gyeol's ability to be shrewd with people's intentions to protect his family as a child isn't used as consistently once he's a teenager, instead mostly relying on his academic ability and guitar playing.

While Eun Gyeol does learn about his parent's hardships with the time travel, it does not pay off the characters at the set up. It just ends with basically an alternate universe where his family is rich and famous that Eun Gyeol doesn't even get to experience for himself through new memories and how it has affected the dynamic between him and his family. I think it would have been more fascinating if Eun Gyeol could travel back and forth between the two timelines, learning information from the past that he could not or not completely change, but could improve his relationship with his family in the present instead. There was not enough time in the new present once Eun Gyeol arrived to at least emotionally reconcile with the most important relationship to the entire series, which is Eun Gyeol and his father. It's weird that no one from the Watermelon band can remember his name either, since Yi Chan and Chung Ha give the exact name to their kid. Did they not name him after their friend?

Eun Yu's plan to have her mother Se Kyung to get with a first love so she would never be born never made any sense from the start because she not possessing her mom's mind, she's in an entirely different body. Even if she got the first love to fall in love with her, her mom is on an entirely different continent. The show never played it like she misunderstood this, so it's doubly bewildering. Her romance with Eun Gyeol was also really tacked on and her own journey as a character was really pushed to the side. Her relationship with her mother was really traumatic to the point one of the first things she did when she went back in time was to set up a noose in her mother's childhood bedroom where she was going to commit suicide. Did she have love for music on her own? Is photography her true passion? Her own grandfather is the powerful ghost that gained godly powers in death that organized this trip for her, but she's basically there to support his star pupil.

Having neither Eun Gyeol or Eun Yu figure out that they are both time travelers until the end also made it pointless to have two time travelers as helpers to each other. Their opposing goals may have been an intriguing premise on paper, but the execution made it redundant. It would have been more interesting if Se Kyung really was the person that Eun Gyeol was interacting with all along. She has a real bond with Chung Ha, really uninterested with Yi Chan, and was actually in love with her future doctor husband with the golden pipes. This could have been an amazing friendship and partnership that could have interesting ramifications for the future they create rather than yet another bland forced romance with no chemistry. Yi Chan's obstinance in winning over Se Gyung also went into uncomfortable territory with him only outwardly choosing Chung Ha when Se Gyeong ditches the performances. Chung Ha deserves so much better than that, but at least when the show finally gets to them, they are a truly sweet couple

I love it so much that everyone around Chung Ha makes an effort to communicate with her, either through writing or learning sign language for her. Yi Chan who has trouble focusing on school subjects got very conversationally fluent, very fast, and it helps that they were also both learning at around the same time. The way that her internal life is shown by her thoughts and drawings is very nice as well. Her abuse at the hands of the step mom was horrific with her father who had enabled this was also really rushed. He honestly didn't react apologetically enough finding out what he had allowed to happen to her once he understood the scope of it. 12 years of it, my heart broke so much for her when Eun Gyeol finally found her, when someone finally cared enough to find her. This is yet another of a long list of issues of the show bringing up really intense topics, but not addressing them fully. Her future kid looks exactly like her mother who is taken away for unknown reasons also never explained by the show.

It was really interesting to watch this drama and High Cookie coincidentally back to back, both starring Choi Hyun Wook in the main roles but with very different personality types. I'm very curious to see his next role after this one. His Yi Chan is very effervescent, energetic, and tenacious, truly the heart of the show, living out his goal of shining in his youth as much as he can to the max, while being kind to the elderly and kids. His time traveling son giving him the sense of fatherly love he was missing was so touching because he's the one that modeled that kind of love for his son. Their friendship and reciprocal love for each other is really sweet, though I'm not sure how to feel about the gay jokes the show makes. It makes sense for Eun Gyeol's intensity towards Yi Chan to be taken as a crush and the show doesn't seem to have anyone disgusted by it. Walking a very fine line. The ultimate car related accident is handled better than most kdramas, instead of the character randomly running into traffic, which the show actually has them do multiple times as red herrings, it's actually attempted murder, and Yi Chan saves his bestie/son.