I've Been in the Library for Ten Years and I'm Invincible.

Traveling to a different world and becoming a handyman disciple guarding the library, Lin San thought he would spend his whole life doing nothing, but he was bound to a sign-in system, and he could get rewards for signing in anywhere. Sign in at the Library Pavilion and get the Traveling Baguazhang! Sign in at the Evil Spirit Cave and get the Butterfly Swords! Sign in in the harem and get the Nine Transformation Soul Awakening Pill! ....... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.