In the Solo Leveling anime, Sung Jin-Woo's rise from weakest hunter to top hunter is not only marked by the monsters he kills in prison but also by the people he is forced to kill along the way. During the prison raid in the Solo Leveling series, betrayal is common, and often, the strong always prey on the weak without hesitation. For Jin-Woo, killing people when the system forces him to do so is not a choice he makes lightly. However, in the series, when he decided to choose between himself and the bewildered hunter, he always chooses himself.

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Hwang Dongsuk Group
The deadly installation in the prison
In the series, Hwang Dongsuk's group made the mistake of underestimating Jin-Woo, seeing him as nothing more than expendable weaklings. Putting them in a C-rank prison should be a death sentence for Jin-Woo, but instead, it becomes a platform to kill them. Dongsuk's group is a C-rank hunter who deliberately invites Jin-Woo and Joon Jinho, a lower hunter, to join them under the pretense of needing support. In reality, Jin-Woo and Jinho are nothing more than pawns to help them clean up the prison and keep the vital stones for them. When the eight hunters enter the dungeon, they fight small animals until they find the boss's cave. When Dongsuk and his party learn that most of the keystones are in their boss's cave, they seal off the cave's exit to make sure Jin-Woo and Jinho don't escape. They were planning to get the keystones out of the other exit while the jailer was having a party with Jin-Woo and Jinho. Whatever happens in prison stays there, so no one will know about their brutality.
Also, after Jin-Woo defeats the spider boss in the prison, Dongsuk and his party leave their hideout to finish them off. Since Jin-Woo and Jinho are low hunters, they are harmless. Jin-Woo's sound system detects Dongsuk's party as an obstacle and forces Jin-Woo to kill them. That way, Jin-woo had no choice but to kill them to get high, but there's a chance that Jin-woo would have just injured them so he and Jinho could leave the prison. The system, however, has turned Jin-woo into a bloodthirsty maniac, and as Dongsuk's men run toward him, expecting an easy kill, Jin-woo reacts faster than they can. Woo killed them all. After everything, Jin-Woo and Jinho were the last men standing.

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Kang Taeshik
Dealing with killers
The confrontation between Jin-Woo and Taeshik happened during a prison patrol, a type of mission sent by criminals who are also hunters to the prison as a dumping job. Taeshik is a member of the Hunter Society and a follower of three dangerous criminals. His role in the raid is to house these prisoners and ensure that they do not escape. With Taeshik, the prisoners and Jin-Woo; There are also four other hunters, and two of them are hunters Jin-Woo who survived the Double Dok trial along with Song Chi-Yul and healer Lee Joohee. Eight hunters made this attack, but the situation quickly turned upside down.
During the attack, the prisoners, who are considered dangerous criminals, are brutally killed by Taeshik instead of being allowed to fight with the prison animals. The father of the prisoners' daughter begs Taeshik to kill them to avenge his daughter's death. However, Taeshik is just a psychopath who loves to kill. For killing these prisoners, Taeshik is found by two other hunters, but he also kills them to cover up his crime. After that, Taeshik turned to Jin-Woo, Joohee, and Chi-Yul. When it turns out that the danger in the prison is Taeshik, not the monsters, Jin-Woo steps in to protect the remaining hunters.
Kang Taeshik knew that Jin-Woo was not like the other weak hunters, and for the first time he felt threatened.

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Now, the system has automatically upgraded Jin-Woo into a bloodthirsty. Taeshik uses his speed and killing skills to try to attack Jin-Woo, believing that a quick and deadly strike will finish him off. The fight between Jin-Woo and Kang Taeshik was fast, brutal and decisive. Jin-Woo's intuition and acting skills allow Jin-Woo to predict Taeshik's movements, and he chooses the right moment to strike Taeshik.
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Kim Chul
The Battle of the Ice Zone
Jin-Woo raids a prison with A-rank hunter Kim Chul and eight other hunters. The simple attack turned into a disaster when the C-rank prison turned into a red gate. Red Gates represent a death sentence for any hunter unlucky enough to be trapped inside. Unlike normal gates, which are predictable, the red gate is a one-way prison where, once a hunter enters, there is no way out until the prison is cleared. Jin-Woo and the others find themselves in the Ice Elves and Ice Bears area, allowing him to ascend. However, Kim Chul splits the group into two, keeping the stronger members with him and the weaker members with Jin-Woo.
During the attack, the ice elves easily killed all the hunters with Kim Chul, and he fled the scene in fear. As Kim Chul sneaks through the forest, he sees the other hunters with Jin-Woo, which angers him. Therefore, he blames his defeat on a member of Jin-Woo's team for withholding supplies (tents, food, and clothing) for them while his party died unjustly. By this time, Jin-Woo had already confronted the ice elves and called the shadow hunters to help in the fight. Kim Chul blames Jin-Woo for his accident and plans to kill him. As the battle with the elves rages on, Kim Chul finds an opening to kill Jin-Woo, but just as he lets his guard down, Igris's spear impales him in the chest. His last reaction was one of pure horror and regret, for it was too late that his cowardice had led him to such danger. Jin-Woo activates his necromancer skills and raises him as a shadow soldier to serve him forever.