Help Me Identify This Korean Movie

It was shot like a proper k drama with nice cinematography which is similar to that of such shows. It is not like those Korean softcore porn movies where everything leads to banging.

It does have some sex scenes but almost no nudity. The main actress is very slim and pretty. I don't think I have seen her in any other movie or show. She has a very slim figure but big boobs and her hair is long. I couldn't understand anything they said because there were no subtitles so the scenes I described are based on what I saw was happening.

In the beginning, the main guy is upset about something and the main girl, who is his neighbor, comes out and talks to him. They decide something and go to their respective apartments. Then they video chat where the girl strips or something. There is no nudity here, only her shoulders.

Apparently, they start dating after this and a couple of sex scenes is shown with a little bit of nudity. In one scene, the couple is at a cafe, seated next to a large window. The main guy's friend is outside with a girl and spots them. The friend sees the main girl slowly remove her panties from underneath her skirt and hand them to the main guy. She's got really long and sexy legs.

In another scene, the friend visited the main guy and is sleeping in his bed. The main girl comes in and thinking it's the main guy, puts her hand inside his pants. When she realizes it's his friend, they both scream.

This is all I can remember, I guess. I think it's got a very wholesome ending and the movie is generally pretty wholesome. So, if anyone can identify this, it'd be great. Thanks..