Playing an older brother in the film "The Commitment" has prompted Choi Seung Hyun, a.k.a. Bigbang's T.O.P. to think about what it means to be a big brother.

In real life, the singer-turned actor has an older sister but not a younger one. However in his movie role, he plays Myung Hoon, a North Korean student who must abandon his dream of becoming a pianist to become an undercover agent.

He does so to protect his younger sister, Hye Ri, played by Kim Yoo Jung. In the film he would sacrifice anything for her.

But in real life, what kind of older brother would he make? While you never know what kind of sister you would wind up with, he can only guess how he would act based on his friendship with co-star Kim Yoo Jung.

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