Male. Kind. The admin of this group chat. Formerly Seoul Metro / Seoul Metropolitan Rapid Transit Corporation. Launched on May 30, 2017, following the merger of the two entities. Operates Line 1 (underground section from Seoul Station to Cheongnyangni), Line 2, Line 3 (Gupabal to Ogeum), Line 4 (Jinjeop to Namtaeryeong), Line 5, Line 6, Line 7, and Line 8. Uses "Pungnyeon" (Bountiful Year) as the transfer music. A legendary incident occurred where he sued Dawonsys (a train manufacturer and absolute bastard that delayed deliveries and produced low-quality trains) for fraud and returned the 5th batch of Line 5 trains. Dislikes Fox Transit and Pig Transit.

Male. Kind but scary. Speaks in Busan dialect. Operates Busan Line 1, Line 2, Line 3, Line 4, and Line 5 (under construction, scheduled to open in early 2029). Uses "Sea Breeze" as the transfer music. There is a legendary incident where a display error at a Line 1 station caused the arrival board to be plastered with "Bim-bim-bim-bim-bim-bim-bim-bim." Uniquely, Busan Line 4 has the lowest ridership in the country (which is why Line 4 specifically is deep in deficit). Loves Haeundae. Terrifying when angry. Dislikes Fox Transit and Pig Transit.

Male. Hot-blooded and sly. Formerly Daegu Metropolitan Transit Corporation. Speaks in Daegu dialect. Operates Daegu Line 1, Line 2, Line 3, Line 4 (construction pending), Line 5 (planned), and Line 6 (planned). Uses a portion of the Daegu Transportation Corp logo song as the transfer music. Recently, Line 3 operations were briefly suspended due to a power supply failure (since Line 3 is a monorail). Dislikes Fox Transit and Pig Transit. Dating Daejeon Transportation Corp. Extremely scary when angry (especially if someone messes with Daejeon Transportation Corp).

Female. Very playful and a total prankster. Formerly Daejeon Metropolitan Express Transit Corporation. Speaks in Chungcheong dialect. Operates Daejeon Line 1 and Line 2 (under construction as a tram, scheduled to open in 2028). No transfer music (currently only has one line, so no transfer stations exist. However, transfers to high-speed rail are possible at Daejeon Station). Unlike Gwangju, the single line is so well-designed that it stays quite crowded. Dislikes Fox Transit and Pig Transit. Dating Daegu Transportation Corp.

Female. Funny and lethargic. Formerly Gwangju Metropolitan Rapid Transit Corporation. Speaks in Jeolla dialect. Operates Gwangju Line 1 and Line 2 (under construction, scheduled to open in the first half of 2028). No transfer music (same as Daejeon. However, transfers to high-speed rail are possible at Gwangju Songjeong Station). Gwangju Line 1 is famous for avoiding all high-demand areas, resulting in very low ridership. It even has the nickname "Air Transport." Her swearing is brutal (e.g., "I'll pull out your ribs and play them like a piano," or "Hey, are you gonna sleep until the sun crawls up your backside?!"). Dislikes Fox Transit and Pig Transit.

Female. Excessively cute, a total man-eater who constantly flirts with men but is cold and angry toward women (double-faced). Operates Fox Line, Men's Line, and Pretty Line (under construction, opening repeatedly delayed to 2067). Uses "Song on How to Seduce Men" as the transfer music. Ridership on the Fox and Men's lines is abysmal. (The lines are in an awkward location that is neither Seoul nor Gyeonggi, and they only transfer to each other, with no connections to other nearby lines—even though Heart Station on the Fox Line is only 2km from Macheon Station on Line 5.) She does have a conscience and feels guilt, making her somewhat likable. Constantly adds "♡" to the end of her sentences (e.g., "Oppa~♡♡♡♡♡♡ Am I cute?♡♡"). It's intense. Dislikes Daejeon Transportation Corp and Gwangju Transportation Corp.

Male. Acts like a tough guy/bully but is actually a total loser. Operates Pig Line and Oink Line (passed feasibility study, but he keeps delaying construction because he's lazy). No transfer music (same as Gwangju and Daejeon, but he doesn't even have high-speed rail transfers). The Pig Line averages only 67 passengers a day. This is because it's far from Seoul, has poor accessibility, is short, and avoids high-demand areas. Constantly talks about the "Dark Flame Dragon" inside him. Tries to act cool. Thinks he's popular. Pro-Japanese sympathizer. Obsessed with women. Watches weeb anime like "Re:Zero" or "Alya Sometimes Hides Her Feelings in Russian." Uses annoying otaku speech markers (e.g., "I'm very popular, nung!!"). A total otaku. Hates men and constantly tries to act tough and threaten them. Acts cute toward women and constantly asks them to date him.