I've just seen a table of Sin Chin-seo's career track record for official games. Hard to believe he started off with a negative record!

2012 (age 12) 0W-2L = 0%
2013 (age 13) 30-20 = 60%
2014 (age 14) 55-28 = 66%
2015 (age 15) 64-22-1 = 74%
2016 (age 16) 55-18 = 75%
2017 (age 17) 53-16 = 76%
2018 (age 18) 82-25 = 76%
2019 (age 19) 78-20 = 79%
2020 (age 20) 76-10 = 88%
2021 (age 21) 80-17 = 82%
2022 (age 22) 40-5-1 = 88% (as of end May).

And presumably the opposition got tougher as he got older, and as he played more title/finals matches!

The 107 games he played in 2018 is astronomical. The most in Japan last year was 79 by Ueno Asami, and that was considered hugely impressive.

Today marks 1 year since he last lost (an official game) to a non-Korean player (Mi Yuting in the Jia League). Since then he has played (and won) 24 games against Chinese players, 5 games against Japanese players, and 1 game against Taiwanese players.

For comparison, here is Lee Changho's career up to his age 22 season:

1986 (age 11) 8-3 = 73%
1987 (age 12) 44-11 = 80%
1988 (age 13) 75-10 = 88%
1989 (age 14) 84-28 = 75%
1990 (age 15) 80-14 = 85%
1991 (age 16) 66-20 = 77%
1992 (age 17) 81-24 = 77%
1993 (age 18) 91-21 = 81%
1994 (age 19) 76-20 = 79%
1995 (age 20) 73-15 = 83%
1996 (age 21) 79-32 = 71%
1997 (age 22) 76-22 = 78%
Total (up to 1997) 833-220 = 79%

Consulting https://senseis.xmp.net/?KidoPrizes I can tell you that the following are the Kido Awards for the most games played in a single year by a Nihon Ki-in player, since 1991, from 70 games up. None of them come very close to Shin's 107 (Hane was 19 games away).

1. Hane Naoki, 88, 2001
2. Cho U, 84, 2002
3. Ueno Asami, 79, 2021
=4. Yamashita Keigo, 77, 2000
=4. Cho U, 77, 2003
=6. Kono Rin, 76, 2014
=6. Ichiriki Ryo, 76, 2020
=7. Yamashita Keigo, 75, 1998
=7. Takao Shinji, 75, 1999
9. Cho U, 73, 2007
10. Yamashita Keigo, 71, 2004
11. Ichiriki Ryo, 70, 2019

Looking at those Lee Changho stats that were supplied, I see that he surpassed Shin Jinseo's 2018 in the following years.

=1. 112, 1989
=1. 112, 1993
2. 111, 1996

He was also beating Hane's 88 every single year after turning 13.

What counts as an "official" game? Presumably blitz games on Fox do not count.

Um . . . Korea has a lot of fast games while Japan has significantly more slow games.