What's so funny about this?

staring at Mu Shaocheng."I'm sorry, I've let you down." Mu Shaochen hadn't been able to sleep well these past few days, his face haggard and drawn.Both of them were suffering, and when they heard Mu..., "Let's do a DNA test."Upon hearing this, Lin Jinran's eyes lit up instantly. She hadn't thought of it at all!A DNA test can directly detect whether she has a blood relationship with Gu Meng. Compare...