I’m not sure about the specific details what they talked about regarding the first 2 minutes but on the first part the hosts asked who were the older females he acted with and he later said he wants to date older ones after the hosts asked his age. The hosts then teased him in making the older female hosts comfortable by calling them by their names only. However, the staff/actresses (on the films he’d done) wants him to call them “noona” instead of “sunbaenim” even though he feels uncomfortable sometimes (not sure about this). In the last part, the host asked if hajoon calls kijoo “noona” as well then hajoon stuttered a little bit “Yes? ah yes noona?” (OMG THIS HUHUHU) then the host teased him again for not calling kijoo noona then kijoo said “he just calls me yah!” as she swept her hair from the side. The hosts then sang “누난 내여지니까” which translates to “because noona is a woman” song by lee seunggi to tease them because kijoo is 2 years older than hajoon but hajoon later explained that because their teamwork is close and they worked hard in the set they don’t feel that much gap but he calls her noona. - This is based on my understanding as I am currently learning korean (not my native language). If I happen to be wrong, all corrections are welcome :)
They were teasing them because the hosts asked him "Do you call Ki Joo Noona(sister) in the scenes?" Then he said "Whatt...Noona....Pardon??" Then Ki Joo said he usually call her "Hey!" After that the hosts teased them like they are lovers XD. After that Ki Joo flipped her hair to the right and one of the hosts said "She even flipped her hair to let Ha Joon see her neck" 😂😂😂