Jackson is currently in mourning and will be attending his grandfather's funeral on October 28-29.

The idol star's agency revealed the saddening news via GOT7's official fan site, saying, "We ask fans would please understand that Jackson will not be participating in any planned schedules during this time."

SEE ALSO: K-netizens brings to light the movie that was used as a reference for NewJeans "Attention"

Meanwhile, GOT7 is busy promoting their latest album '7 for 7'.

We send out our deepest condolences.