Could someone please fill me in how the current younger Park Kwang Ho (the one that died) got involved in investigating…
Mok Jin Woo killed one of the friends of younger Kwang Ho and he witnessed it if i'm not mistaken, that's why he started investigating Mok Jin Woo, i don't think he knew about the 30 years ago case but he did enough to make Mok Jin Woo kill him. And the other point is that he just hated/loved his mom too much then he got to know the veteran psychopath and he started to get influenced, he was just killing because he couldn't kill his mother but he make himself belief that it was because he was doing divine punishment
I saw W and Signal and i have to say that although W is a good drama, Signal is in another level, i don't understand how it didn't win anything, and DOTS as the best of the year is a bit disappointing