When high school teacher Na Ae Joon 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 Si Yeol, 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, Si Yeol takes an interest in Ae Joon and asks him to join the show as his “co-teacher.”Desperate to keep his fan life a secret, Ae Joon is forced to put his acting skills to the test, and not just on camera. But as he spends more and more time with Si Yeol, the deception becomes harder to keep up. Not to mention, he might not be the only one keeping secrets…(Source: tappytoon.com)~~ Adapted from the webtoon "My Bias Is Showing?!" (최애가 나타났다?!) written by Nabit (나빛) and illustrated by Eol (얼).