Who Is Whose Substitute?

[Both leads are virgins + mistaken stand-in identities + mistaken unrequited love + love at first sight + the male lead's groveling redemption arc + happy ending]

If the stand-in resembles the one in your heart even more than the real thing, then who is the stand-in, and who is the one you truly love?

Five years ago, Ye Xiyuan and Xi Yunting fell in love at first sight at a masquerade ball, but neither knew the other's identity.

Ye Xiyuan wasn't supposed to be at the ball in the first place.

Tang Yuwan wanted to ruin the event, which was called a ball but was really a matchmaking party, so she hired Ye Xiyuan to impersonate her. The two looked so alike that, once they put on masks, they could pass for each other perfectly.

What no one expected was that Xi Yunting would fall in love with Ye Xiyuan while she was impersonating Tang Yuwan.

But before he could pursue her, circumstances changed: Xi Yunting needed to be hospitalized for brain surgery.

After the surgery, Tang Yuwan went abroad.

Five years later, Ye Xiyuan and Xi Yunting meet again. The familiar feeling draws them toward each other without either of them realizing it.

But Xi Yunting still believes the woman at the ball was Tang Yuwan. And the irritable temper he developed as a side effect of his brain surgery makes Ye Xiyuan certain he can't be the same person.

Even though they both know the other isn't the person they hold in their heart, they still can't control their instincts.