"Straight" Concubine in the Prince's Palace

Summary

Why would a straight man get tangled up with three three other men?! Due to a forced-push game ad, the male lead Lu Xing has mistakenly entered the world of a dating sim. In order to get back to the real world, he needs to collect three male characters' favour? Cold princes, mysterious assassins, gentle guards , which one of them is his ultimate pick? The battle of the straight man is about to start now!