I like Jung Woo Jin, too except he made a bet with his cousin that he'll get Mari to marry him. Also, Mari is not in love with him. Inspite of Chulsoo's weaknesses, Mari loves him very much. After all, with all the passionate kisses, warm tight hugs & sleeping together in the hostel, just prove that they are very much in love. Chulsoo is a man of few words & he has a hard saying certain words like I like you because of his past experience with his mother. He's not romantic in term of words, but his actions speaks very loud. All his novels were done because of his aching heart for Mari. So, let's just wait & see who Mari will choose. Remember forced love will not result in good marriage.