Weird Dagger Romcom

A couple of years ago, i watched a movie where this Asian guy isn’t very good a dagger throwing. One day he come upon criminals,they all inhale this toxic gas.Well the main guy falls into the ocean and soaks in water. He becomes fat, meets a reporter, and starts crushing on her. Well the next day once all the water is out. He is skinny and stops a robber with his new pro dagger skills. He becomes famous. But a criminal from the beginning had a different reaction to the gas and becomes all big and orange and bad. He tries to make that reporter girl love him. But she loves the main character and ends up taking a dagger to the chest for him. Please help me. I cant remember the title and i would love to see it again.

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