I'm a woman with an impenetrable wall

One day, the protagonist, Chae Ga-eun, met her junior, Hong Ji-soo. She was a very smart class president, and he was a delinquent. As soon as they met, Ji-soo fell for Ga-eun and relentlessly pursued her, leading to a happy ending where they started dating. (His personality changes as soon as he hears that Ga-eun's ideal type is a kind person.)