The Ripple (2010)

Security guard Cheung is a loving father who takes good care of his children. As his kids grow older, they have their own lives and that leaves Chueng feeling lonely. He displaces his fatherly love onto his colleague Sheung's young children instead. This innocent act, however, makes his daughter suspect that Cheung and Sheung are having an affair and a small incident risks being blown out of scale.