Deep in the night at the entrance of a Taoist temple, a round and cute baby gets lost and wanders in. The patrolling senior brother Wencai and junior brother Qiusheng originally intend to catch a demon, but are instantly conquered by its adorable gaze. Taoist Master Lin is initially strict in his attitude, but unexpectedly discovers that the cute baby possesses a special constitution that can purify evil energy, and thus makes an exception to let it stay temporarily. As they get along deeper, the cute baby's "unintentional mischief" continuously triggers a chain of hilarious crises: flying paper cranes awaken mountain ghosts, looking into the ancient mirror shows no reflection, mistaking Wencai for its father leads to an amnesia farce, and even attracts various characters taking turns interacting, such as a female ghost, a paper doll legion, and a rooster spirit.