Ang Biyenang Hindi Tumatawa

"When a mother-in-law SCOLDS--that's ordinary, GOSSIPS--that's understandable, DESPAIRS--that's bearable. But when a mother-in-law just won't laugh--WHAT A MISFORTUNE."

Trining and Mario are a young married couple who are happy with their lives. However, Aling Badang, the titular mother-in-law who did not laugh, is very serious all the time. Will she ever feel happiness and laughter or just become frowning serious woman forever?