Three unknow Korean coins or tokens? [solved]

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I am lost on the winding back road of the Black Forest that contains (1) top, (2) middle, and (3)bottom.

1 and 2 have the identical obverse that is different from 3. However, it seems that they (judged by the colours) are made of different alloys, and the Korean character on their reverses vary. Details are provided below:

(1) d 19mm, w 2.7g
(2) d 19mm, w 2.7g
(3) d 18mm, w 2.4g

Therefore, i am calling for your swords and sorcery to aid me again.

Hello

the third one seems to be a bus token
there is this one on numista but not exactly the same
https://en.numista.com/catalogue/pieces92329.html

https://en.numista.com/catalogue/pieces52849.html
this one for the first and the second but not exactly the same

Quote: "gros"​https://en.numista.com/catalogue/pieces52849.html
​this one for the first and the second but not exactly the same

​Thank you, my friend. I ll try to be a good student.

The 1st and 3rd are bus tokens for Pusan or Busan. The middle is a bus token for Taegu or Daegu

I think the first one is the same as this it’s hard for me to zoom in and make out the characters.

https://en.numista.com/catalogue/pieces108304.html

Matt

The one on top and the one on bottom are Busan city bus tokens. The one in the middle is a Daegu city bus token.