Age Gap

20-year gap between a spiritual/paranormal consultant?? (late 30s) and a girl in an arranged marriage.
Pretty sure they only went for a kiss on the forehead.

This one's risky. So this widower met his daughter's friend. They got comfortable with each other, and the whole package of social dilemmas arose.
They went for a kiss.

Lung surgeon (45) & medical clerk/nail technician (26).
For me, the romance kinda takes back seat in the end with this one.
It's a heartfelt story tho, and the art's simply gorgeous.

Detective & high school girl.
They kissed.

16 yo high school girl pursues her 28 yo neighbor. Girl's treated as a kid until they reunite when she turned 20. Nothing sexual, not a kiss.

1/2

A step dad (30s?) & his step daughter (17). Nothing sexual, not a kiss. Started out as pretty regular dad-daughter relationship. At the very end, it's hinted that the girl's steering the relationship to a different direction.

The relationship between the MCs is far from romantical, but I adore how these two affect each other. One of my all time favorite manga/manhwa.

Teacher (29) & student (16).
I think they kissed? Or not? My bad I don't recall

Idk where I got it, but for a while I thought the guy's just an old looking 18 yo. No, he's 30. Girl's 12.
I think they kissed at one point.