Number 4’s mission.
Number 4’s target was the CEO of “CGM” , a rival company to REM. CGM was a technological company that was created six years ago. It was led by an old man with poor financial decisions so it’s estimated worth was nothing much till the election of their new CEO “Kim Haesong”.
Kim Haesong was a South Korean middle aged man who was overly righteous and meticulous. He took work very seriously and ever since his election, the company has had a dramatic reform. Within three years Kim Haesong was elected, CGM, which was way below REM in terms of technology, turned into a centre of innovation and cutting edge technology.
Number 4 understood the reason why Han Ji Suk didn't attack him sooner because Han Ji Suk never went against things he considered beneath him but considering that CGM has begun to hurt REM with its pricing strategy and product design, it's safe to say that Han Ji Suk has had enough.