I feel like Esom will return because they mentioned her names twice in season 2
At first her name mentioned in ep 1 where Mr Jang collect money in subway station, he was talking to her on call Then Second time her name got mentioned in ep 15 where Do Gi got off the transfer prison bus to go prison, Go Eun mention her name to Do Gi through communication
(It took me almost 30 minutes to find her name mentioned because I almost forgot where and when they mentioned her name 😂)
Season 2 is DONEEE! Now, let’s pray they will doing season 3 Also Do Gi and Go Eun is really teasing us for saying these lines at last scene where they have beer on rooftop
3 
Then Second time her name got mentioned in ep 15 where Do Gi got off the transfer prison bus to go prison, Go Eun mention her name to Do Gi through communication
(It took me almost 30 minutes to find her name mentioned because I almost forgot where and when they mentioned her name 😂)
https://www.soompi.com/article/1580438wpp/taxi-driver-confirmed-to-return-for-season-3
https://www.soompi.com/article/1580438wpp/taxi-driver-confirmed-to-return-for-season-3
https://www.soompi.com/article/1580438wpp/taxi-driver-confirmed-to-return-for-season-3
https://www.soompi.com/article/1580438wpp/taxi-driver-confirmed-to-return-for-season-3
https://www.soompi.com/article/1580438wpp/taxi-driver-confirmed-to-return-for-season-3
Thank you for trying helping me tho
Also Do Gi and Go Eun is really teasing us for saying these lines at last scene where they have beer on rooftop