Lee Seung-hyun, who was even thinking of marriage, suddenly had his girlfriend break up with him. Seung-hyun is uncomfortable with Yoon Yi-sun, a junior at work who is rumored to be with his ex-girlfriend. Although he consciously tries to distance himself from Yi-sun, he slowly opens up to him. At first, Yi-sun was just cute because he kept bugging him, but then he said, "That's normal, right? I can't stop it no matter how hard I try. Just say no and forget it." Gradually, Yi-sun deep eyes confuse his mind.