It's such a great drama that I rewatched it again. Storyline is wonderful, cast shows their character's emotions really well, and the OST is also wonderful.
The camera work and angles capture the scenes really well, and honestly, it just makes the drama so much better.

While rewatching it, in Episode 11, there's a easter egg (background music wise in a scene-- not the drama's OST). In one of the scenes, i'm pretty sure I heard an OST from Marriage Not Dating (same directors for both these dramas) and the ironic part is that one of the cast members from Marriage Not Dating and Another Oh Hae Young was in the scene when the OST from Marriage Not Dating was playing. I thought I'd share my discovery.