(I shouldn't have kissed her) Watching ep 1-2 makes me totally get why Gong Ji-hyeok went Gong-ral mode.

He thought love didn't exist, but she seemed like such a decent person + then BAM, one kiss and he was just straight-up head over heels LOL. Gong Ji-hyeok probably finished imagining Da-rim walking down the aisle at that point. But then he meets her again and she's married? Yeah, that's enough to send anyone spiraling LOL.