My Interpretation of the Ending Version 1....
Joon Suk didn't order the hit:
- First off, Joon-Suk values friendship. He mentions friendship several times in the film and its probably the one thing he truly values in life. It seems as if Joon-Suk was the one who always got the four of them together to hang out. All four of them were close friends.
- He finally realizes what the word 'friend' really meant, and that's someone who sticks close by your side through thick and thin. Now who has been that one person who stayed by Joon Suk's side ever since they were kids? Dong-Su.
- He goes and meets up with Dong-Su because he realizes that he was a true friend. Tries to save him by asking to go to Hawaii together. Dong-Su refuses and we know what happens afterwards.
- When Dong-Su is killed, Jook-Suk takes the blame because it was just straight up humiliating and embarrassing for his underlings to disrespect him like that and carry out the killing without his permission. He is the boss, yet his underlings didn't respect his orders (to not touch Dong-Su). Joon-Suk had no choice but to falsely admit that he ordered the killing of his friend to save face.
- Could Sang-Gon (Dong-Su's boss) have been possibly involved in Dong-Su's death? The boss is shady as hell. He's the one who talks about loyalty to Dong-Su early on in the film at the restaurant and yet, I got the sense that it was all talk and that loyalty = money to him.
- Both Sun-Taek and the other friend wanted Joon-Suk to deny any resonpsibility for the death of Dong-Su.
- At the end, Sun-Taek asks Joon-Suk if he admitted to the crime because he felt bad for Dong-Su. Joon-Suk felt horrible that Dong-Su was a victim of gang business, and with this sudden realization that Dong-Su was his one true friend who stood by him thick and thin, (and the fact that his underlings betrayed his words) he wanted to do him a favor by admitting to the crime. Also remember Joon-Suk was going to go to Hawaii to lay low for a while and told Dong-Su to come along with him because he knew sht was going to hit the fan. Why would Joon-Suk kill Dong-Su on the same day as his father's memorial service?