This is actually kind of a spoiler but TJ came into the criminal world because of Ian. First, out of love for him (although he himself did not understand this) & then to save him. Taejoon refused the opportunity to get into professional sports and took up arms, realizing that he needed power and support in order to protect the person dear to him. TJ never asked for anything in return for the sacrifices he made, so accusing him of manipulation is stupid. It has already been said that being in the organization was a necessity because it gave the two of them the strength to resist their enemies.
The difference with Jo is huge. TJ never wanted to posses Ian & did not limit his communication, realizing that his loved one is not an object but a living person with whom he wants to spend the future together. But Joseph... let's be honest, this guy never liked the real Ian. He immediately began to condemn his way of life, imposing his worldview, trying in every possible way to prohibit him from sleeping with other men. Jo also manipulated him more than once, accusing him of lying, throwing tantrums, pretending that his fingers were still broken, etc. But yeah, the worst thing he ever did was how the brаt had the audacity to take advantage of Ian's unconscious body & сum on his face, humiliating him and marking him as his toy. Since a person who has fainted cannot give consent, it would be correct to consider what happened as ra**. This is what possessiveness means.
