This is a relatively well written drama, with a meaningful storyline. However, I do not think the timetravel aspect added much to this drama. The story is also extremely mediocre after they entered college. This would be a 9/10 drama if the drama ended around ep. 16.

The characters are quite awesome, even though I think the acting was sometimes weak. Each character has its own beliefs and quirks that make them standout, without being overly obnoxious. The dynamic of the friend group is the highlight. Some character actions and development is really questionable....

Overall this drama has obvious flaws, but I would still recommend it to you. Especially if you like dramas like Lovely Us, where the emphasis is on youth and friendships with a side touch of family issues.