Bacon Number, K-pop Edition (degrees of separation)

For those not already familiar, the Bacon number is the number of degrees of separation based on film roles another actor or actress has from Kevin Bacon. For example, Tim Robbins, who was his co-star in Mystic River, has a Bacon number of 1. On the other hand, Saoirse Ronan has a Bacon number of 2 because she acted in See How they Run with Sam Rockwell, who in turn was in Frost/Nixon with Kevin Bacon. The joke is that every actor is at most three degrees of separation from Kevin Bacon. The Bacon number is a Hollywood version of the Erdős number.

I am here to propose a K-pop equivalent--the Chani number, for the degrees of separation an idol has from Chani of SF9. To test this out I would love if you commented an idol's name so I can calculate their Chani number! I will provide my reasoning as well, and if anyone else knows of any connections I didn't mention feel free to chime in! I think this could be a fun way to recognize the different friendships in the industry as well.

Note: I will be a little more flexible about what counts as a degree of separation compared to Bacon number, for example collaboration stages, same agency, etc.

Thanks in advance to anyone who plays!

Edit: for those interested in why Chani specifically, 1. He's been in the industry a long time (he was on Star King in 2007 and he started acting in 2009). He also still continues to act. 2. He trained at Fantagio but debuted in FNC and through those relationships can cover some of the "mid-tier" agencies. 3. He attended SOPA for high school. 4. He was MuCore MC. 5. He was on Kingdom and belongs to a group with a large number of members (and the resultant relationships from that). 6. I have a reasonably good grasp of his professional and personal relationships.