what does '순하게 생겼다는 이야기를 많이 듣는데, 드럼 스틱만 쥐면 눈빛이 달라진다.' mean?
I tried translating it but couldn't understand. If that can help the person talking is a drummer. Before this sentence he said that playing the drums show off his charms and he says right after that he becomes a 상남자. thank you for your help!

Question

Answer

'순하게 생겼다는 이야기를 많이 듣는데, 드럼 스틱만 쥐면 눈빛이 달라진다.' 
=> (lit.) I often hear comments that I look obedient, but my eyes start to flash once I pick up the drumsticks.
=> People tell me I appear meek in temperament, but I feel transformed once I pick up my drumsticks.

- [[순하게 생겼다]는 이야기]를 많이 듣는데 = I often hear [comments that [I look meek/obedient in temperament]], but ...
- 드럼 스틱만 쥐면 = once I pick up my drumsticks.
- 눈빛이 달라진다 = the look in my eyes changes (idiom) -> (I) become a different person .

One small flaw is that 눈빛이 달라진다 sounds a bit unnatural if you use it to describe yourself.

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