"Stealing people's hearts seems to be your forte, Sir?"

"It's fun to see people crumbling beneath my firm grasp. Because I stole their heart."

"I wouldn't let anyone steal mine that easily."

"If you're vulnerable, I'll gladly steal that heart away."

There are dangerous people Luhan knows of. The ones who takes advantage of his beauty or innocence. The ones who chases after him. The ones who demands and craves for his attention - for he was quite a respectable young man. But he has never heard of the Heart Thief. He hears anecdotes and snippets from friends and family about a young man his age stealing hearts of men and women alike. He basks under the attention of people. He will make you fall for him in an instant, or in some strange circumstances he has you wrapped around his long slender fingers, whispering sweet nothings into your ear till you are trapped under his hold. Only vicious lies he feeds to you. Nothing but lies. They warn him to stay away. However, Luhan can't help but feel intrigued about this Heart Thief. In his quest to learn more about the Heart Thief he too falls desperately into the grasp of the man himself. Will he be strong enough to withstand the advances of the Heart Thief or simply has his self-retraint devoured by the saccharine words the Heart Thief has to say?

As their fates converge into a single path, Luhan and the mysterious Heart Thief finally learns the true meaning of love and sincerity.