In 2008, Ko directed the film , along with Vincent Fang, Chen Yi-xian and Huang Zijiao. In 2010, Ko directed the film You Are the Apple of My Eye, based on his book . In 2011, Ko adapted his "Killer" series into the film The Killer Who Never Kills. He produced a documentary focusing on Taiwan's animal shelters in 2012, titled Twelve Nights. In 2014, another of Ko's books was adapted into the film Café. Waiting. Love. The film adaptation of another of Ko's books, Kung Fu, was originally set to be released in 2014, but its release date was pushed back to 2015. In September 2015, Ko announced another book–to–film adaption, The Tenants Downstairs, was to be released in 2016.
