Steam : Game finder 제작자: Nebukam

Simply add a user using its nickname, or if it doesn't work, paste a link to her/his community profile page (for example : https://steamcommunity.com/profiles/76561197970839736 or https://steamcommunity.com/id/nebukam/ ) and you're good to go from there !

Note that a user data is stored on your computer for later use : if after some time you find that some games recently purchased are missing, make sure to click the "refresh profiles" button :)