Lee Seunghyun, a man who was suddenly dumped by the girlfriend he had expected to marry. And the man at the forefront of his troubles—Yoon Yisun, his junior at work who's rumored to be her new fling. Seunghyun does everything he can to avoid Yisun, but slowly begins to open his heart to the man who finds a way to be with him at every turn. At first, Seunghyun just thought that Yisun was cute when he said he'd had a hard time because he couldn't see him, but... "That's usually how it should be, right? To accept when something isn't meant to be, and giving up. But I can't seem to do that, no matter how hard I try." As time goes on, the way Yisun looks at him throws his heart into disarray.