Nice, I'm #9 in the second list, those being flagged! And, he's #1 in that list as well, so it might explain why he's flagging back.
I'm not going to dig into this, but since you took the time to share today's list, you might want to investigate when @haejin's activity got him onto that list in the first place. My guess is it's within the last week.
Seems he started showing up on the "being flagged" list on the 19th and on the active flaggers list on the 20th.