Love for Love's Sake

Both dramas are about a protagonist who is/was not happy in life and is thrown into a new situation (game/past). While fixed on a mission in the new scenario (make Yeowoon happy/protect his father) they discover the main reason why they are there: To be happy themselves and enjoy their youth. Both dramas have an amazing Ost and great acting, not to forget are filled with love for the project by the cast and the staff working on it.

Although the male lead doesn't time-travel in Love for Love's Sake like in Always Meet Again, he is transported in a game where the adult him becomes a high schooler again to save the other male lead.

Nothing similar but both are ongoings series that I need to finish watching. I have watch cherry magic the Japanese one only to see my beloved Eiji Akaso.

Both are highschool BL dramas that tackle some very dark and heavy topics such as abuse, neglect and depression. The feel of both BLs is very similar in that it can be dark at times, but there is also hope as well.