A Pi Ni Han Khun Yai Thong Kum

When the new superhero looks just like our grandmother...
"Kaew" (Kate Thantup) is a low-ranking young police officer who dreams of advancing in his career like everyone else. He finds himself falling back in love with "Nubdao" (Fai Nichanun Funkaew), his childhood first love who has now become an angelic TV news anchor. However, he faces stiff competition for her heart from "Pakorn," a flawless and highly sought-after young businessman.
Just as Kaew is about to quickly give up hope, his younger sister "Kwan," a crime reporter, brings an elderly woman named "Grandma Thongkam" home to live with them. Grandma Thongkam doesn't look any different from your average grandmother, except for one major detail: she possesses superhuman powers.
Together, Kaew and Grandma must team up to investigate various locations depending on the case. Even though they might not be completely successful every time, they always manage to survive and get out of trouble thanks to Grandma's miraculous abilities.