Hugging the Thigh of the Future Demon Lord Tightly

The century-old tree demon who is quirky but unemotional VS the future demon who seems cynical but is actually strategizing. She tried her best to stay by his side, thinking that she was pretending to be perfect, but she couldn't escape his eyes. He originally thought that she was approaching him with a purpose, but he didn't expect that she really just wanted to stay by his side, and he was the only one who fell into the relationship. Why? Why did she try so hard to get close to him, but she was the one who suffered in the end? "Say again you don't love me!" "No love." "Don't like it? Then try it!" Is it a calculation? Or is this how fate should have been? Is it the elf of the fairy mountain or the lover of the demon king? "I knew you were plotting against me, but I didn't expect that you were plotting to stay by my side."