It depends on the specific plot and character dynamics of the manhwa. Sometimes such a scene might occur if it fits the story and the relationship between the characters.
The 'Valentine Kiss' manhwa is about a pair who encounter various situations leading up to a passionate kiss on Valentine's. It might include their past, present, and hopes for the future, all woven around this central event of the kiss.
It's a romantic tale about a girl who unexpectedly finds love with a prince. There are lots of sweet and challenging moments as their relationship develops.
It really depends on the context and the relationship between the characters. Sometimes it's a sweet and romantic gesture, but it could also be inappropriate depending on the situation.
Single romance manhwa often focus on the emotional journey of one character in finding love. They usually have beautiful art and heartwarming storylines.