All the Signs Yi-Jin Is Min-Chae's Father on "Twenty-Five Twenty-One"

In episode 10, present-day Hee-Do drives Min-Chae to the hospital to get her bruise checked out in a red car reminiscent of Yi-Jin's red convertible, where he and Hee-Do shared many of their relationship-defining moments. Could the red car be a hint that Yi-Jin is still part of Hee-Do and Min-Chae's lives?