If you liked the set up of the first episode with the tease of the wedding, and then a whole drama about figuring out who the husband is then the Reply series is for you. Reply 1988 focuses more on the husband hunt and heavily dropping hints. Love Relationship is much more mellow in that aspect and just lets you enjoy the ride (the progression of the narrative is in a relatively chronological order, while Reply 1988 bounces a lot between the past and the present or the future.) In Reply 1988 both of the male leads are friends, much like in Love Relationship, but are far more closer imo (they're true bffs, while in Love Relationship I feel like the screenwriters failed to portray closeness & the supposed friendship between male leads). If you like slow-burn romance then this drama is for you: with 20 episodes and most episodes extending into 1 and half hour mark, it's a long ride you're gonna enjoy. That being said, don't be afraid of the length of the episodes! Reply 1988 is so much more than just first love; it's also about friendships and family. The main cast is large and each get their own story so you'll have plenty to enjoy!~