Both have the same male main lead and genre. Cops vs culprit is a huge theme as well. Great action scenes.
While Two Weeks is about saving the hero's daughter in The Chaser the hero wants to take revenge for his daughter. Both dramas are emotionally very intense and both heroes end up being on the run and fighting against powerful people.
A man, accused of a crime he didn't commit, is on the run to save his ailing daughter and to clear his name.
Both feature main characters on the run. Despite the fact there are several leads in Runaway, one portrayed by Ichihara Hayato also has a critically sick daughter (his primary reason for fleeing).
...both dramas are about dads who fight for their kids life, both dramas has well made roles and captivating story.
Same story, different time period. The two little girls are equally cute, but I choose Lee Jun ki a thousand times over Lee Dong Wook, sorry!
Both stories consist of escape (the main character was accused of crime he has never committed and he had a cute, but ill daughter). Only the time frame is different. ^^
They're stories with amazing exciting plot, In both shows the main character is being chased by the Authority for a murder he never committed, with many higher up villains help cover up the truth, so the main character start living a Fugitive life.
Both are intense conspiracy dramas. Three days is not exactly like Two weeks, because the journeys the protagonists are going through. But, both have a lot of heart in midst of desperation. While, the chips are down both heroes look for inspiration in people they care for and keep pushing through. The pace and the feel is very similar in both the dramas and both have pretty tight scripts.