Jungwoo is an insecure boyfriend, which is why you fight often because he is also jealous of you for no reason.  it is sometimes too annoying, although he is always gentle and caring towards you. 
he is quite clingy and can cry easily, but he loves you very much indeed.  he would never forgive himself if he lost you.  he also often has obsessive thoughts and Jungwoo often asks you if he doesn't look very bad when he goes somewhere.  his self-esteem is quite low