Angry Mom all the way. It's so unique, funny and sad. It has all emotions! Perfect drama! Also it has Ji Soo in it ;)
Also I remember you! I'm a lover of Seo In Guk. And I "met" Park Bo Gum for the first time in this drama. The chemistry between the couple and the bromance is so good!
Reply 1997. Seo In Guk is in it as well ^^ This drama is so unique and really good. What I liked especially is the strong and sassy female lead. She's not strong physically but has her own mind and is really rebellious. I liked it the most from the Reply series.
Sassy Go Go! Really unique and refreshing high school drama! The chemistry was really good!
(sorry too many recommendations, but I'd start with angry mom!)