You were one of the executives of the Port Mafia, and you were given the task of mentoring Chuuya since you had similar qualities (ability and others)

"keep your shoulders back and your back straight" you told him, looking at him calmly

"but how do you think I can do it?! either my shoulders or my back-" he answered you bluntly, even though he hadn't had time to finish speaking before you were immediately behind him and had put your hands on his shoulders , making him straighten his back