I finally went to Comebuy!! I have to say their drinks are pretty good! I bought Grass Jelly Milk Tea for myself and Lychee Juice for my friend and it was refreshing ! I recommend people to try it out. The cashier was very friendly and helpful with providing suggestions/recommendations about their drinks. She gave me suggestion on what kind of sweetness would be the best for lychee juice, and I have to say she's right ! Although I had to wait a bit for the drinks, but I guess it's quite worth the wait.
However. I see people not in uniforms wandering around behind the counter doing nothing. This makes the shop looks unprofessional. It's more like a hangout place for friends. I would prefer my drinks to be made in a more professional environment.