Sharing an apartment for three years, Su Wan quietly took charge of all public supplies and hygiene for the whole house, collecting only a small public share each month while subsidizing out of pocket year after year. New roommate Tang Rui moved in, winning people over under the guise of free purchasing and taking turns on duty, only to falsely accuse Su Wan of embezzling the public share. Heartbroken, Su Wan stopped contributing, cheap and inferior supplies broke down one after another, and the apartment-sharing conflicts completely erupted. Su Wan brought out all the bills from three years, and the truth came to light under the testimony of roommate Lu Xiaolu. Everyone woke up to reality, and together they established a transparent apartment-sharing convention, understanding that clear accounts make friendships last long.