Because of the Block-B's drama, Chanyeol ever called P.O and comfort him. Luhan also did this to Jaehyo since they are close.
“For chanyeol, block-b’s p.o is like his dongsaeng. and it has been 5 years, they hadn’t meet, so chanyeol feel sad to see him like this”
- Manager Oppa.
(source: he told me)