Do you really think even the archery scene was easy? The first time Hong Eun Jo tried to save her brother from…
You seem to have gotten the wrong idea. I'm not dismissing the actress's effort or putting down the capabilities of Gildong or Eun-jo. I'm talking about how it is another story where FML needs saving by ML, even though she is introduced as a strong character; physically strong!
Writer remembered FML as Gildong had quite the athletic prowess; made her shoot an arrow off just so ML could come and take over with a sword and save the day! Yay! Bleh -_-
Maybe a bit late and you might have figured it out, Cheon is a surname like Kim, Baek, Park, Shin etc...also it's symbolic in a way to his 1000 won fees policy because Cheon translates to 1000 or thousand.