Summary: Zewu-jun. Lan Xichen was called by this name since it is his title. However, he doesn't know why that, of all many people, he would like to be called by one person - Jiang Cheng. He found the reason as he stared at those flushed cheeks. P.S.: the fanart cover isn't mine! credits to the artist! i'll update the name when i found it!