Next stop happiness to Kwang Hee what proton therapy means

Proton therapy is one of the latest research results of Ezee's dad's company, which can cure brain tumors much higher than the normal cure rate. That's why Mitsuhiko's mom wants him to undergo the treatment. However, once he accepts this treatment, it is the same as accepting Ezee's dad's help and owing their family a favor. One would have to go out with Yixi. And Lighten likes Mu Orange, so he would rather accept the usual treatment.