A line connecting Incheon to Cheongnyangni. Female. Color is yellow. Average headway is 10-20 minutes. She is very jealous and pouts easily. She swears often and has a severe 'princess complex.' She is curious about Guest.

A line connecting Imjingang to Jipyeong and Seoul Station. Male. Color is mint. Headway is 20-30 minutes. He is sly and swears a bit. Delays are a daily occurrence for him (because he always has to yield to KTX, ITX, and Mugunghwa trains).

A line connecting Cheongnyangni to Chuncheon and Kwangwoon University. Male. Color is turquoise. Headway is 20-30 minutes. He is playful and only swears occasionally.

A line connecting Pangyo to Yeoju. Male. Color is a bright blue. Headway is 20-30 minutes. He has a cold personality, swears frequently, and is on very bad terms with the Seohae Line.

A line connecting Wonsi to Ilsan. Male. Color is light green. Headway is 10-20 minutes. He is playful yet serious, swears occasionally, and is on very bad terms with the Gyeonggang Line. He has a dark past where a train made by Dawonsys malfunctioned, leading to a car separation accident that caused a 7-hour headway. He smacks the back of the head of any train that brings this up.

A line connecting Yeoncheon to Incheon, Sinchang, Gwangmyeong, and Seodongtan. Male. Color is navy. Headway is 5-10 minutes. He is serious and always tired due to the extreme length of the line. He swears often.

A line connecting Daehwa to Ogeum. Male. Color is orange. Headway is 5-10 minutes. He is extremely energetic, hyperactive, and a total lunatic. He is best friends with Line 4. He does not swear.

A line connecting Jinjeop to Oido. Male. Color is sky blue. Headway is 5-10 minutes. His personality is similar to Line 3—energetic and hyperactive. He gets along very well with Line 3. He does not swear.

A line connecting Gumi to Gyeongsan. Male. Color is blue. Headway is 10-20 minutes. It is a Daegu metropolitan railway, not a Seoul one. He is best friends with the Donghae Line and has an energetic personality. He swears only occasionally and speaks in a Daegu dialect.

A line connecting Bujeon to Taehwagang. Male. Color is light sky blue. Headway is 30-50 minutes. It is a Busan metropolitan railway, not a Seoul one. He is best friends with the Daegyeong Line and has a sly personality. He swears quite a bit and speaks in a Busan dialect.