The Code of Siam (2019)

A man walking the thin line between good and evil is an ingenious criminal. Yet he abides by the law and serves time in prison. One day before release, his ex-girlfriend who also happens to be his biggest rival runs into serious trouble, leaving him no choice but to escape in order to save her. 

The story originates in the Golden Triangle where drug trade is proliferate. Xia Tian gambles with his life against a notorious drug lord and wins big. News of Xia Tian's misdeeds reach Zhang Li who works for the Interpol. As it turns out, she is Xia Tian's ex-girlfriend and the apple of his eye. Despite being cop and bandit, the two were lovers who relished engaging in a game of cat and mouse. 

Zhang Li and her superior Peter arrive at the Golden Triangle. The drug lord gets killed in the fray and Xia Tian gets arrested as the murderer. He is sent to prison in Myanmar to serve time but breaks out a day before completing his sentence in order to save Zhang Li from certain death. While Xia Tian succeeds, he realizes that someone intentionally plotted his escape. Under the orders of Peter, Xia Tian and Zhang Li head to Bangkok to begin their investigation where they encounter many mysteries - a missing plane, a long-awaited reunion and a huge conspiracy. 

(Source: ChineseDrama.info)