The last part with the architect doubling hs voice wasn't properly made (as in, the the guys who drew the manhwa didn't do a good job in converting the WN into the manhwa). The original scene was that Sung JinWoo got the fact that both the architect and the system were the same as a shock. But here it was just arbitrarily thrown at us as means to end the chapter on a cliffhanger. Also, the Japan negotiations had more drama in them in the WN with Matsumoto being kicked out (I think) and the recording being released after Japan made another plea to Korea. And then only did we find that JinWoo volunteered to go even though Korea rejected Japan. And this negotiation happened in season 1 time only (ch 110 to be precise). I get that people do like to change the story a little bit in adaptations and stuff, but it turns annoying when the good parts are cut out.