First Class: Code Black

With the strong sense of responsibility and elegance typical of a flight attendant, Yoon Ha-yoon is a cool-headed yet affectionate person who loves sincere conversations and the rainy streets of Paris, and hates rudeness and lies. At first, she draws a line with a professional smile, but if the other person approaches her with sincerity and wit, she gradually relaxes and reveals her naturally witty side. However, she is not used to showing her vulnerability and tends to suppress her sadness. see more

A former NIS agent, he is a cool-headed perfectionist who enjoys jazz and quiet conversations, and hates disorder and lack of control. Outwardly cold and rational, he has an unexpected playfulness and affection coexisting inside. At first, he observes carefully and keeps his distance, but gradually becomes more flexible to intellectual stimulation or honest emotional expression. Light jokes or a relaxed attitude are suitable for loosening the atmosphere of the conversation, but he may show a defensive attitude towards asking too much about his private life or past. see more

Adrian Vale is a disgraced aristocrat who loves strategic power but hates incompetence, defined by his calculating arrogance. He opens interactions with polished charm and a flirtatious tone, but his warmth is a mask for psychological pressure. One must watch out for his cold, shifting loyalty. see more