Well, typically, underlining in a short story isn't very common. Usually, bolding or italicizing is used for emphasis. But if it makes sense for your particular style or needs, you could underline.
It depends. If you want to emphasize certain parts or make them stand out for a specific purpose, underlining can be helpful. But it's not a strict rule.
I wouldn't say there's a definite yes or no. It might be okay to underline if it serves a clear purpose, like highlighting key points or creating a visual effect you want. However, in many cases, other formatting options might be more conventional.
Chapter 82, "Whether I Can Do It or Not Is My Business", is the clearest early answer because it turns Luo Ming's situation into a concrete plot event. It opens with Leader, the number of people has been counted. and closes on I won't say much more." Xia Hong did not say much, and after two.... The key payoff is that the chapter closes with As Xia Hong finished speaking, the whole place fell silent., which gives Luo Ming a stronger narrative position and pushes the power growth onward.
Chapter 78, "Accepting the Grand Gift", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The chapter gives readers a real answer by opening on A unique valley with an excellent location, highly concealed and... and ending on Firstly, I'm afraid seeing it will remind me of people; secondly, I'm....
Chapter 111, "Escape from Desperation [3-in-1 Mega Chapter]", is the clearest early answer because it turns Chen Ping's situation into a concrete plot event. Early on, After listening for a while, Chen Ying quietly descended, his waxy.... By the end, Chen Ying followed the sound and found a grown woman by the bonfire,....
Chapter 105, "New Home Construction, Strength Bottleneck [Two in One]", is the clearest early answer because it turns Mu Dong's situation into a concrete plot event. The chapter gives readers a real answer by opening on When the new house construction idea was first proposed, Mu Dong... and ending on And that's just for the four outer walls..
Chapter 117, "Teng Jiao Saliva and Poison Source [Combined Chapters]", is the clearest early answer because it turns Shi Ping's situation into a concrete plot event. It opens with Although Xia Hong understood this principle, he had no way to improve... and closes on Inside that meat, there was a pure white round pearl, emitting a....
Chapter 106, "Expanding Hunting Grounds, Camp Expansion [3-in-1]", is the clearest early answer because it turns Hunting Team's situation into a concrete plot event. The chapter turns that into something concrete by moving from Xia Hong made up his mind and quickly gathered Xia Chuan, Luo Yuan,... to Six months ago, with a Hunting Team composed of fifteen Logging....
Chapter 167, "Seizing the Mirror, He Yuanhun's Confidence", is the clearest early answer because it turns Skin Remodeling's situation into a concrete plot event. A useful checkpoint is the way the scene starts with From the moment he emerged, the Mirror Immortal Camp was no longer a... and follows through with Then, the two mirrors began to slowly fall..
Chapter 116, "Great Righteousness, Hunting Flood Dragons, Saliva [Five-in-One Mega Chapter]", 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 The serpent creature with a severed tail struggled with balance and,... to However, Yuan Cheng's anguished scream immediately made his heart....
Chapter 116, "Great Righteousness, Hunting Flood Dragons, Saliva [Five-in-One Mega Chapter]", is the clearest early answer because it turns Hunting Flood Dragons's situation into a concrete plot event. It opens with The serpent creature with a severed tail struggled with balance and,... and closes on However, Yuan Cheng's anguished scream immediately made his heart.... The key payoff is that the chapter closes with Seeing Yuan Cheng's back rapidly recovering, Xia Hong's mood instantly relaxed.
Chapter 114, "New House, New Rules, New Starting Point [Four-in-One Mega Chapter]", is the clearest early answer because it turns Camp Supply Station's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Living on the second floor is definitely more comfortable than the... and follows through with After Xia Chuan had roughly explained the new contribution value....