Maybe Blue is sick and gives a kiss to show gratitude. But it really depends on the specific plot of the cartoon.
It could be that Blue has a special relationship with the doctor and the kiss is a form of affection or a part of a story twist. We need more context to know for sure.
Perhaps Blue is injured and the kiss is a symbol of hope or comfort. But without further details about the cartoon, it's hard to say exactly.
Chapter 141, "Intermediate Thunder Kui, Second Reshaping Skin [Three in One]", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. Early on, Not only that, but above the Ice Tree, lightning occasionally.... By the end, Unexpectedly, we encountered an Intermediate one before even hunting.... Inside the broader trade and resources storyline, the chapter closes with The swamp beside the tree was likely the Thunder Kui's habitat.
Chapter 145, "Murder, Gruesome", is the clearest early answer because it turns Redwood Ridge's situation into a concrete plot event. A useful checkpoint is the way the scene starts with One whistle for an encounter with a Cold Beast; two whistles for an... and follows through with How many have you killed?" He Gang turned back, seeing the wound on....
Chapter 105, "New Home Construction, Strength Bottleneck [Two in One]", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. The setup is The outskirts of Redwood Ridge, at a boundary of five hundred meters., but the pressure keeps building through Xia Hong, with a few people, hid in a tree, all staring below..
Chapter 45, "My name is Xia Hong, the Great Xia Leader [Here He Comes]", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter gives readers a real answer by opening on As soon as night fell on the second day, Shi Qing went to find Luo... and ending on Even Rogel Camp couldn't possibly have five Loggers so young..
Chapter 64, "Letting These Two Kids Off Easy", is the clearest early answer because it turns Solidified Fire Oil's situation into a concrete plot event. The chapter turns that into something concrete by moving from Hehehehehe....." The Wood Puppet Monster peered into the ravine,... to The Wood Puppet Monster was talking about the Solidified Fire Oil!.
Chapter 198, "Unblocking Acupoints, Breakthrough Imminent", is the clearest early answer because Xia Chuan finally turns buildup into a real advancement. The chapter turns that into something concrete by moving from Big brother..." "Don't talk, focus on cultivation, it's almost... to Xia Chuan didn't have a system; his perception of the skin remodeling....
Chapter 93, "Regrouping at the Camp", is the clearest early answer because it turns Luo Yuan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with In the end, the four large knives fell into the hands of Luo Yuan,... and follows through with With unity, the overall strength improvement becomes naturally....
Chapter 158, "Preparation, Arrival", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. The chapter turns that into something concrete by moving from This kind of thing, of course, should be handled with a "better safe... to The main hall on the third floor was the Martial Arts Training....
Chapter 75, "Changing the Rules for Meat Distribution After Amendment", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter gives readers a real answer by opening on The Da Shi Camp has already been destroyed, and the 500-meter area... and ending on Xia Hong turned to look at him and Yuan Cheng without answering,....
Chapter 108, "Long-tailed Rodent [3-in-1 Mega Chapter]", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The setup is The power of the swarming Cold Beasts was already something Xia Hong..., but the pressure keeps building through At that time, there were only fifteen Frost Wolves..