Tony Leung, actor: ‘I considered quitting because I was on the verge of an existential boredom, but working with Wong Kar-wai transformed me’

His role in ‘In the Mood for Love’ made him the world’s most melancholic lover. But the Hong Kong actor is versatile: he started with comic roles and moved on to action films. His latest release is ‘Silent Friend,’ in which he plays a neurologist fascinated by plants