Why do many people say that the relationship between Kim Jong Kook and Song Ji Hyo is very delicate?

I think they may like each other, but they may not be together. They have been running for so many years, the same program. Haha, Gary and China have a good relationship. I think they both liked Xiao Zhi in the early days. The relationship between Monday and Haha is there (although both of them are married and have children), but history cannot be erased, and for personal reasons, I have a friend who has liked it for a long time. The interaction between us is similar to that in Mongolia (hugs and hugs are rare, but we drink the same bottle of water). He should like me, but neither of us will express our feelings or be together. We also have common friends in the same group. People like Haha Gary also liked me and chased me. We can only say that friends are longer and stronger than lovers.