Marriage, Not Dating is a South Korean romance drama.

Gong Gi-tae (Yeon Woo-jin) is a plastic surgeon who just wants to live alone in this specific house but mom Shin Bong-hyang (the veteran Kim Have-sook who I've seen in multiple K-Dramas) keeps setting him up on blind dates and badgering him for money.

Gi-tae helps his best friend Lee Hoon-dong (Hey Jung-min) break up with his girlfriend Joo Jang-mi (Han Groo) who was about to propose marriage. This leads to Gi-tae and Jang-mi not liking each other — well, she doesn't like him and he feels a bit sorry that she got dumped the way she did.

Gi-tae convinces Jang-mi to pose as his girlfriend — both in order to keep his mom away and to make Hong-dong jealous. Being forced to pretend starts to become more and more real especially for Jang-mi who is much more out there and shows her emotions. Gi-tae might feel the same but he's very introverted and instead treats her badly in order to keep her attention.

Complication is that Jang-mi moves on from Hoon-dong and pursues the handsome Han Yeo-reum (Jeong Jin-woon) who also likes her so Gi-tae is constantly interrupting their romance. Meanwhile Gi-tae's ex-fiancee Kang Se-ah (Han Sun-hwa) is back. She is also a doctor and they had an amicable breakup but she is secretly still in love with Jang-mi and a much more suitable match from Bong-hyang's perspective.

A side romance involves Jang-mi's friend and co-worker Nam Hyun-hee (Yoon So-hee) who pursues Hoon-dong after he dumps Jang-mi, though once he gets jealous Hong-dong pursues Jang-mi again (and she's moved on to Yeo-reum)…

Took a bit but I ended up liking this series. At first I thought Han Groo was over-acting but I think the character is more of a Lucille Ball physical comedy as Jang-mi is constantly accidentally hitting things or when she's "acting" she takes it way over the top. In contrast Gi-tae is a rather subdued character who likes Jang-mi but can't show his affections other than being mean to her which is off-putting.

Overall it's a good series.