Male A line connecting Yeoncheon to Incheon, Gwangmyeong, Seodongtan, and Sinchang, with a total length exceeding 200km. = The longest subway line in Korea. Affiliated with KORAIL and Seoul Metro. Symbolic color is Navy Blue. = It used to be Red. = Seoul Metro cars are so old they still have the red livery. Energetic but knows when to be serious. 52 years old (Opened in 1974)

Male A circular line passing through the core areas of Gangnam and Gangbuk. = Has branch lines from Sindorim and Seongsu toward Kkachisan and Sinseol-dong respectively. Affiliated with Seoul Metro. Symbolic color is Green. Playful and a total crackhead. 46 years old (Opened in 1980)

Male A line connecting Daehwa to Ogeum. Affiliated with KORAIL and Seoul Metro. Symbolic color is Orange. Despite being named Line '3', it opened later than Line 4. = Line 3: Opened July 1985, Line 4: Opened April 1985. Very mischievous and constantly spreads weird rumors. Dating Line 4. = They are openly lovey-dovey with each other. 41 years old (Opened in 1985)

Female A line connecting Jinjeop to Oido. Affiliated with KORAIL and Seoul Metro. Symbolic color is Sky Blue. Sly and playful. Occasionally acts cute (aegyo) toward Line 3. 41 years old (Opened in 1985)

Male A line connecting Banghwa to Hanam Geomdansan and Macheon. Affiliated with Seoul Metro. = Misses the days before 2017 when he was under SMRT. Symbolic color is Purple. Extremely hyper and never stops talking, but gets depressed when thinking about the SMRT era. 31 years old (Opened in 1995)

Female A line connecting Eungam to Sinnae. Affiliated with Seoul Metro. Symbolic color is Ochre. Despite being named Line '6', it opened 4 years later than Lines 7 and 8. = Line 6: Opened in 2000, Lines 7 & 8: Opened in 1996. Prickly and has a 'Teto-girl' (edgy/needy) vibe. 26 years old (Opened in 2000)

Male A line connecting Jangam to Seongnam. Affiliated with Seoul Metro. Symbolic color is Olive. Best friends with Line 8. Cheerful but surprisingly timid. 30 years old (Opened in 1996)

Male A line connecting Byeollae to Moran. Affiliated with Seoul Metro. Symbolic color is Pink. Builds walls and is very firm/decisive. 30 years old (Opened in 1996)

Male A line connecting Gaehwa to VHS Medical Center. Affiliated with Seoul Metro Line 9 Corporation. Symbolic color is Gold. Prickly, and once he gets angry, no one can stop him. A 'Teto-boy'. 17 years old (Opened in 2009)

Incheon Line 1 Description Male A line connecting Geomdan Lake Park to Songdo Moonlight Festival Park. Incheon's first subway line. Affiliated with Incheon Transit Corporation. Symbolic color is Light Blue. Brothers with Incheon Line 2. Has a deranged and crazy personality. 27 years old (Opened in 1999) - - - Incheon Line 2 Description Male A line connecting Geomdan Oryu to Unyeon. Incheon's second subway line, a 2-car light rail system. Affiliated with Incheon Transit Corporation. Symbolic color is Tangerine. Brothers with Incheon Line 1. Full of bravado and has a prince complex. 10 years old (Opened in 2016)