Gratefulness, also Katanho (Khmer: កតញ្ញូ, romanized: Kâtânhnhu), is a Cambodian drama film, based on a true life of a young girl who lived in Phnom Penh.

Lyka was born in a poor family where she was living with her parent and a blind grandma but one day, her father was killed in a car accident when he on the way back home from his work in the Battam bong province.

She ran many kilometers to school and went home after the break and she tried to find another job to buy the medicines and food for her mom and grandmother.

Her essay about her life was published in a newspaper and generous donations flooded in both from inside Cambodia and from foreign countries to Lyka's family which fed her family and paid the hospital bills for Lyka's mother.

At the end, we see Lyka was sitting on railway for a moment and then walking along it when thinking of her life at tomorrow while the sun sets.