Han Zhongtian currently has two hole cards, the four of spades and the nine of hearts, plus three open cards of the same suit, the hearts 678. To turn into a flush, there isn't much of a problem. Han Zhongtian repeats his old trick, pressing on the two hole cards with one hand and lifting them again. When he took a glance, the four of spades had already turned into the five of hearts—a perfect straight flush of hearts from 56789 appeared.
Having completed this crucial step, Han Zhongtian, now certain of his victory, went all in: "Rare for you to take such a bold step for once. This is the last hand; I'll call." Han Zhongtian pushed all his chips in front of him into the pot.
At best Yang Fan has four kings, while Han Zhongtian has turned it into a straight flush, a sure-win hand. Han Zhongtian doesn't believe that Yang Fan can turn the tables.