Yoosung is the youngest and perhaps least-jaded member of the RFA, and is often scolded like a child despite being a college student. He is secretly intelligent and used to be at the top of his class. He cares about others almost to a fault, and loves to spend time with his friends despite his more recent inclinations towards introversion. He is incredibly naive despite his book smarts, and due to this, is a frequent target of Seven's outlandish pranks. Even so, he considers Seven to be his closest friend, and the pair are frequently seen bonding over video games and their love of junk food.

Despite his somewhat naive and lighthearted nature, Yoosung became severely depressed after the death of his cousin, Rika, who he idolized and was very close with. After her death, Yoosung lost all interest in his studies and became a shut-in, rarely leaving for classes and opting instead to play LOLOL (an MMO similar to World of Warcraft) in order to cope with the crippling sadness. However, at his core he is a generally kind and bubbly person, if a bit childish at times.

During Yoosung's route in the original game, Seven mentions that he secretly has yandere-esque tenancies; this is verified in a bad ending in which his erratic behavior results in the death of himself and the main character. However, outside of this ending, he portrayed as a generally sweet and stable person aside from mild possessiveness and the tendency to hold a grudge.

Voice Quality/Tone: High to medium-high pitched. A little bubbly, sounds happy by default, and at times loud and enthusiastic when excited. Doesn't shy away from expressing irritation when warranted, though it often comes across as more mopey than anything hostile. Has a youthful and innocent air.

Voice reference: https://www.youtube.com/watch?v=4sW-FTxmq5E