I like the detail of neither of them saying "I love you too" but rather just "I love you". to some people one might seem like just a response, and the other one more sincere
like professor cha was the one who supplied the shady guy the pills and (based on the dialogue after he sold it) he insisted that that the guy try to sell it to jiheon without telling him of any side effects. he then used jiheon as a middleman to get to wooju
I like the detail of neither of them saying "I love you too" but rather just "I love you". to some people one might seem like just a response, and the other one more sincere