In this photo Calvin stated that he wanted to thank his good brother for some great gloves and now he was going to also become HULK. and with just the referencing and the photo of the gloves its easy to say that its Wu Chun he is referring to.
This photo Calvin uploaded stating that he was "...Singing for you." and that 'YOU' may be just anyone of you lucky ladies and supporters out there ahha well fans all that can be said is that he is working hard and putting in a lot of effort to bring us a good EP!
Congrats Calvin and still anticipating you're future works.