Lin Que inherits a rundown apartment building called Happy Apartment and unexpectedly becomes bound to the Heartless Landlord System. As long as he can come up with creative excuses to squeeze money out of his tenants, he will receive generous cash rewards and god-tier equipment from the system. Determined to amass a fortune, Lin Que transforms himself into the ultimate capitalist and a master of psychological manipulation, embarking on an outrageous journey of charging tenants for absolutely everything. Want to watch online courses? Pay a keyboard and mouse wear-and-tear fee! Turn on the air conditioner? Pay a remote control depreciation fee! Even stepping out in the middle of the night to buy a pack of cigarettes comes with a surveillance footage deletion fee!