“It bothers me when one out of every seven of us is missing. I don’t know why, but I just don’t like it. I hope we can be all together. When we are all together, I don’t even think about wanting to die.”

This drama is an adaptation of BU and I'm glad it's really good. Despite some changes, they did an excellent job on the build up between the characters and their relationships, along with the actors' portrayal and chemistry. From the awkward first meetings to building trust with each other and getting closer together. I love watching their friendship and brotherhood despite their different backgrounds and problems. They unite to become each others' ray of light amidst the struggles they faced during the darkness of their separate lives. This drama is so heartwarming with the precious found family trope. But at the same time, the dark themes about their childhood traumas and family secrets are so emotional and intriguing.

This drama is so meaningful and deep while tackling various social issues about dysfunctional family, mental illness, discrimination, poverty, politics, education and more. The mystery regarding the past of their parents and connection to the principal shows how generational trauma starts and their children bearing the pain of their mistakes. Innocent teenagers are forced to suffer due to the evil adults that comes from each of their different environments. This drama is a reflection of reality that conveys important messages while providing consolation and angst to the youth who are beginning to face the world.

From the original BU storyline, this drama acts like a prequel that introduces the 7 protagonists while adding more details about their backgrounds and families. Eventually, this drama left with an open ending where the fantasy aspect of time travel only begins at the end. Hwan, the oldest of the group, carries the weight of responsibilities and guilt, so he goes back in time to save all his friends and prevent them from their tragic fates. He sacrifices himself while being stuck in time loops. This leads to suspicions and demands for Season 2. There's no official confirmation yet, but I hope they really make it happen so the boys' stories can continue.