This is episode 48 of 60 of The Prison He Designed. Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The closing stretch of the season, where the arc pays off.
Master engineer Zhao Xinyuan discovers that his son, Zhao Xiaobai, was framed by tycoon Zhou Bin and imprisoned in Dawn Prison—his own design. He infiltrates it as an inmate to save his son, using his knowledge to turn the fortress into Zhou Bin's tomb. A father's revenge through intellect.