Luo Xiajin couldn't help but complain. She glared at Li Da with disgust, but she was also covering up her inner sourness.

Of course Li Da was unmoved and said: "Okay, okay, we won't be intimate in front of you."

Having said that, Li Da still held Luo Dongqing's hand. Seeing their affectionate expressions, Luo Xiajin pouted aggrievedly.

She didn't know why she was angry. In short, she felt very unhappy, but she didn't know how to vent it out.

An unknown fire was pent up in my heart.

"Okay, let's start with the lecture. The most important thing about trigonometric functions is the induction formula. Master the induction formula and deform it skillfully. Basically, trigonometric functions are divided into points."

Li Da looked at Luo Xiajin's notes to check where she had doubts.

For Li Da, most of the questions are divided into points. This is similar to what the teacher says.

In fact, in the eyes of teachers, those questions are indeed for giving points.

The teacher really didn't lie.

Then, Li Da gave Luo Xiajin a good lecture on odd and even variables, and how to look at quadrants for symbols. This is actually not difficult. Just draw a picture against a table and understand it. It is not difficult if you have to memorize it by rote.

It's really impossible to learn.

Luo Dongqing did not interfere with Luo Xiajin, she just looked at Li Da with a smile.

Seeing Li Da tutoring Luo Xiajin, she seemed to have returned to the past. She and Li Da were also like this. Li Da lectured, and she listened silently. She clearly didn't understand, but Li Da said it was very simple.

, it was a sub-question, which once made her doubt her IQ, her teeth were itching, and she wanted to bite him.

Li Da's side face still looks good now.

Luo Dongqing is not the only one who thinks this way, Li Da is also similar, not to mention that Luo Xiajin also looks very similar to Luo Dongqing, and it does feel like time and space are confused.

Li Da thought and glanced at Luo Dongqing. It happened that Luo Dongqing was also looking at him. Their eyes met, everything was silent, and the sweet feeling rippled in the hearts of the two of them. Only Luo Xiajin,

I feel like I am out of place in this space.

"Okay, I almost understand. Let's practice with a few questions first. You can go and do your work."

Luo Xiajin also saw the flirting between the two, and felt even more unhappy. However, she knew she shouldn't get angry, so she just endured her anger and drove the two out of the room.

After they left, Luo Xiajin looked at her homework and didn't write anything for a long time.

She began to wonder again.

Why does this happen?

Why does my heart burn when I see Li Da and Luo Dongqing looking so affectionate?

Why do I feel so sour and congested now?

Luo Xiajin was a little confused. She closed her eyes and Li Da appeared in her mind again.

"I...could I have fallen in love with him?"

When Luo Xiajin thought of this, she felt panicked and quickly explained to herself.

Impossible, he is already her brother-in-law, how could she like him!

What's more, although Li Da is good-looking, she is not particularly handsome. She is obviously a beauty control, so it is impossible for her to like Li Da.

She must have a little fondness for Li Da out of gratitude, but it's definitely not like her.

Luo Xiajin quickly gave a bunch of reasons, and was still giving more explanations in her mind. Anyway, she just wanted to make herself come to the conclusion that she did not like Li Da.

However……

When the image of Li Da smiling and touching her head appeared in her mind, all the reasons given were instantly shattered.

Luo Xiajin's mood suddenly became very complicated.

She seems...

I really like my brother-in-law.

Realizing this, Luo Xiajin was confused and panicked.

She didn't know what to do. In short, she never thought about taking Li Da away from Luo Dongqing.

"Absolutely don't let anyone know. Maybe it's just a misunderstanding. Don't think too much."

Luo Xiajin comforted herself, but her mind became even more confused. Naturally, she couldn't do the questions.

She planned to go for a walk and get some fresh air.

When they arrived in the living room, they heard the sounds of Luo Dongqing and Li Da having fun.

Only then did she notice that Li Da and Luo Dongqing were in Li Da's bedroom. The door seemed not to be closed tightly, so the sound came out.

Luo Xiajin, who was professionally listening to the corner, subconsciously walked over. She saw the scene in the room through the crack in the door.

Just one glance made her blush.

Didn’t you say you should study hard?

Luo Xiajin did not dare to continue reading and ran back to continue studying. However, now she had no intention of studying at all.

She suddenly felt a little heartbroken and still very sore.

This seemed to corroborate her previous guess.

She probably really fell in love with Li Da.

Half an hour later, Li Da came to check on Luo Xiajin's study status and found that she had just done one question and got it wrong. Li Da explained it again, but he found that Luo Xiajin didn't listen at all.

"Are you worried about anything?"

Luo Xiajin was very well-behaved before, but Li Da felt that there must be something wrong with Luo Xiajin.

She was Luo Dongqing's younger sister, so Li Da naturally treated her as his younger sister. When he found out that she had a problem, he asked with concern.

"Ah, it's okay. What can I have on my mind?"

Luo Xiajin hurriedly covered it up, fearing that Li Da would see what she was thinking.

However, how could this performance be without any worries.

Li Da looked at her for a while and said seriously: "If you encounter any problems, just tell me. Although I don't have much ability, I will definitely try my best to help you if I can."

"I see."

Luo Xiajin lowered her head shyly. She didn't dare to look at Li Da's face, lest she blush and Li Da see what she was thinking.

Li Da didn't think much about it. She didn't think Luo Xiajin was shy. She just thought she might be ashamed and sorry. After all, today's class was almost in vain.
Chapter completed!