The surprises kept on coming once they got to London Stadium, with seats in Club London hospitality, meetings with Jarrod Bowen, Mark Noble and Marlon Harewood, a pitchside visit, and post-match presentation to Aaron Wan-Bissaka of the Official Supporters' Clubs Player of the Year trophy.
It left the pair lost for words as they tried to sum up an unforgettable experience.
"I can't believe what's happened on our trip! It's the best present in my life," said You.
"I couldn't sleep before the game because I was too excited, then I was lost for words when I met Marlon Harewood, Mark Noble and Jarrod Bowen.
"Thank you yo the Club, and EVA Air, for giving me some unforgettable memories."
Kim added: "West Ham is my life, so it's been a very good experience.
"A very big thank you. Come on you Irons!"
Click HERE to learn more about EVA Air, Taiwan’s leading independent airline, who have been our Official Airline Partner since 2018.
EVA Air flies to destinations throughout Asia, Oceania, North America and Europe, operating daily non-stop flights from London Heathrow to Bangkok, and continuing to Taipei, where passengers can easily connect on to every major city in Asia.
Click HERE to find out more about the Korean Hammers.