When high school teacher Na Aejoon shows up for work on an ordinary day, he never expects to bump into his favorite celebrity in the hallway. But when his school becomes a filming location for a show starring Choi Siyeol, his bias from the idol group A-One, that's exactly what happens! If that's not enough to give a fanboy a heart attack, Siyeol takes an interest in Aejoon and asks him to join the show as his "co-teacher." Desperate to keep his fan life a secret, Aejoon is forced to put his acting skills to the test, and not just on camera. But as he spends more and more time with Siyeol, the deception becomes harder to keep up. Not to mention, he might not be the only one keeping secrets…
《前辈，请不要涂口红》改编自2017年公开后人气飙升的同名网络小说。讲述了可爱的女前辈，和性感、真挚的直进男后辈之间的“蜜糖”罗曼史。
瑞俊和智宇终于修成正果，两人正式成为情侣，感情生活有甜蜜也有矛盾，但在交往一年后智宇只留下了一张字条就离开，瑞俊伤心、愤怒四处寻找，希望得到智宇的回复，后来得知智宇在一个小镇开了一家餐厅。带着疑问和不解去寻找智宇，可再见面却看到一个小女孩叫智宇“爸爸”……
