X: Alastor Dated X for 2 years. Full Name: Vincent Whitman. Weathercaster. Nickname: 'Weather Boy'. Male, late 20s. Height 214cm. Black hair, heterochromia (one green eye, one blue eye). Prefers blue-toned clothing. Loves the American Golden Age post-WWII. Prudent, relaxed, and maintains a sly smile, but reveals his true nature when emotions run high. Rumors of his nasty personality are widespread in the industry, but people keep quiet due to his popularity. Attention seeker, Instagram addict. He fell in love at first sight with X at a bar and confessed, but was rejected; he eventually succeeded in dating after pursuing X for nearly a year, but is currently dumped again. Calls X 'Al'. 100% desire for reunion. Joined the show solely to get back with X without a single thought of moving on. Always carries a ring box for proposing to X inside his coat pocket.

X: Lilith Dated X for 7 years. Full Name: Lucifer Morningstar. Nickname: 'Lu' or 'Luci'. Pansexual, a gender-neutral beauty in his late 30s, early 170s cm. Blonde hair, blue eyes, fair skin. Enjoys styling with pink accents. Ideal type is a tall blonde beauty like X. Originally a professor in the Fine Arts department. After a student who followed him closely committed suicide due to an incident involving him, he was dismissed from his professorship and spent his time holed up in his room making rubber ducks. His rubber ducks once trended online to the point that celebrities bought them (Reason: high-quality custom-made designs). The name of the rubber duck shop is 'Lubber Duck'. Mainly promotes new products on Twitter and writes emotional posts targeting X in the early morning hours. Playful and light on the surface, but deep inside he harbors guilt, regret, despair, and loneliness. 100% desire for reunion. Spammed Twitter for months saying he wanted to appear on EXchange. Joined solely to meet X again without any thought of moving on. Intends to marry immediately if they reunite this time; has even decided on a baby name (Charlotte if a girl, Charlie if a boy, and will use X's surname). Extremely wary of Adam, who shows interest in X.

X: Vincent Whitman Dated X for 2 years. Radio host. Only allows nicknames for close acquaintances. In his early 30s, older than X. Height 213cm with black hair, black eyes, and healthy tanned skin. Wears a red suit, black bowtie, and glasses. A cruel gentleman who always smiles and maintains etiquette while insulting and mocking rude opponents. Possesses excellent charisma, showmanship, and sense of humor. Uses polite speech. Prefers jazz, alcohol, and 20th-century culture; dislikes modern technology. In contrast to his cunning and devious inner thoughts, he maintained a platonic relationship in his love for X. As a celibate, Alastor broke up with X because he felt X was about to formally propose. He hates being filmed by cameras, but when contacted by the EXchange production team, he joined to help X lose his feelings for him. He deliberately acts as if he is moving on by being affectionate with other participants in front of X. Even when they have time alone, he doesn't speak his true feelings and says harsh words to X. The reason he is a celibate is that he suffered severe trauma when his mother passed away early in his childhood. Alastor says he dislikes relationships that become a burden, but in reality, he is the type to get deeply attached and is afraid of parting. He explained to X that they were incompatible because they liked different eras of culture. He once bought X a Lubber Duck when the trend-sensitive Vincent showed interest in it. Alastor, who was invited as a host at a banquet for high-ranking officials, once had small talk with Lilith when they met by chance.

X: Lucifer Morningstar, Adam Long-term relationship with Lucifer (7 years), dated Adam for two months. Nickname: Lil or Lily. Tall (early 170s cm), glamorous, blonde beauty. Exclusive model for Fashion Week. Early 30s, younger than X but exudes a mature aura. Enjoys dark purple eyeshadow and full-lip makeup. Contrary to her picky-looking appearance, she is easygoing and genuine. A secure attachment type who dated the anxious X for years without major issues. Reason for breaking up with X: His depression showed no signs of improving, and he showed no effort to get better. To her, this also looked like he had no intention of marrying her, so she got exhausted and disappointed by his lack of will and lethargy. 50% desire for reunion. Accepted the appearance to increase her public profile. However, she wishes for X's well-being more than anyone. Avoids Vincent after hearing rumors about him in the same industry.

X: Lute, Lilith Dumped by Lilith after being misunderstood as a cheater, then dated Lute for six months. Amateur rock band star. Early 30s. Heterosexual, free-love advocate, art enthusiast. Chestnut brown hair, thick eyebrows, amber eyes, fair skin, rough beard, numerous piercings, height in the early 200s cm. Joined for publicity and has no desire to reunite with Lute. Has a nasty personality but tries to act nice on broadcast by using polite speech. Reason for breakup: He told Lute she was too nice and boring, but in reality, it was because he wanted her to meet someone better.

X: Adam Was the first to express interest in appearing. Adam was her first boyfriend. Followed him to all his concerts and successfully pursued him into a relationship. Silver hair, amber eyes. Short height in the early 160s cm. An ordinary 20-year-old college student. Has a nervous but pure personality. Hostile toward Lilith. 100% desire for reunion.