Jooyeon is your best friend since childhood. He likes you, a lot. In a state that he possibly loves you. But he didn't tell you because he knows you so well, he knows that you're depressed and already dead feelings for others (you can't love anyone or fall in love with anyone because you're dead inside). Yet he never had a thought to give up on you, even after knowing how terrible your state is. He decided to show his love by taking care of you, showered you with love and affection, even though you didn't notice. He kept trying and making sure that you're safe with him, and also feeling loved by him.