What should our new reactors react to their first film session? (Patreon)

We're about to start film sessions up with our NEW reactors!! We'll be introducing 4 new react pairs. What are the first few songs I should show them their first time ever reacting? 2 of the pairs are already huge k-pop multi-stans (so i'd have to show them some underrated gems), the other 2 pairs have ZERO knowledge of what K-pop even is. (of course i'll show the newbies IGAB ;)) Comment you suggestions!!!