- They are both rappers.
- Felix was born in Australia while Changbin was born in South Korea.
- They are members of the South Korean boy group Stray Kids.
- Felix had the choice of what pair out of Minho, Changbin and himself would have to kiss another on the cheek, and he chose himself and Changbin. (Stray Kids Ep.3)
- "How is it? You love me." - Felix to Changbin, after Felix chose for Changbin to kiss him on the cheek. (Stray Kids Ep.3)
- Changbin kissed Felix on the cheek for three seconds. (Stray Kids Ep.3)
- "Hyung is really really sorry..." - Changbin to Felix, when Felix was eliminated.
- Changbin said in episode 6 of Two Kids Room that he started becoming confident about his looks after Felix told him how he thought he was handsome when they were still trainees.
- They stated during an interview that, if they could switch bodies with another member, they'd pick each other.
- They have been roommates since early 2019.
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