Friends stuck in that limbo between friend and lover

There's a lot of sexual tension because of that and they act like they are dating even though they aren't. Some other guy tries to woo the female lead and does while they are dealing with their feelings for each other. She thinks it will never happen with the male lead. Eventually the leads do get together.

https://mydramalist.com/12424-drawing-spring

https://mydramalist.com/29517-nang-sao-mai-jam-kad-nam-sakul