The end kiss in Proposal Daisakusen. Yamapi at least leans towards her, while she stays perfectly motionless, arms by the side, lips sealed. The surrounding is beautiful and one has been expecting that kiss for the duration of a true odyssey, which makes it worse.
Jan Di and Gyun Pyo - the kiss on the swing (not even the swing was swinging)
As mentioned elsewhere: Romantic Princess. Ugh. She leans languidly against the wall... he runs towards her... she opens her eyes wide... he stops and waits... for directions? When the kiss finally arrives, it's just hesitant and awkward.