Secrets in the Bathroom

After three years of marriage, Wen Ning has taken on all the housework, while her husband Gu Kai always hides in the bathroom to avoid chores. One day, Wen Ning discovers a lipstick stain on her husband's clothes; he claims it's a surprise lipstick for her, but the bottom of the lipstick is engraved with someone else's name. Suspecting her husband is hiding a secret in the bathroom, Wen Ning finds strands of hair that aren't hers there. She pours out her grievances to her mother-in-law, but when her mother-in-law brings people to search the bathroom, they find nothing. The next day, Wen Ning pretends to make peace with Gu Kai and cooks for him; after he collapses, she searches the bathroom and discovers her husband's unspeakable secret.