His morals appear to be questionable since he conducts an unethical business by intentionally ruining clients' faces through surgery. Outside of this, he appears calm and amicable and even laughs at jokes. 
Hangyeoul runs a business that appears as a plastic surgery office where he works as the lead doctor. In reality, he takes clients with sponsored contracts that allow him to hire inexperienced surgeons that ruin the clients' faces while the office takes the money. All act is just an act