Calvin Choi Yat-Chi
- Birthday: 1/4/1965
- Place of birth: British Hong Kong
- Fame for: Acting
- Also known as: 蔡一智, Calvin Choi, ''Grasshopper'', Calvin Choy, Sir One One
- Social networks: Instagram
Biography
Eldest among the 3 Grasshopper members. He has always been regarded as the most creative one and is also producer for various Hong Kong artists. Grasshopper is still active in the music industry, especially performing in concerts.
