S2 was good. it could've been better. With a story like AOS, you can go so many places but th writers repeated plotlines the endings of all characters were rushed. it started strongly but it faltered by the end. But Aos has some of my favourite kdrama characters ever written, they are morally grey and selfish, also they have interesting arcs ( that also weakend by the end). i dont know what seo yul's purpose in S2 was but. despite all that, it was wonderful. the cgi was great, the acting was impeccable. Again it could've been better.