Sangchul is probably one of the best math professors I have ever met at UCLA. Although he just received his Ph.D. in 2019 and became a first-year lecturer, he really knew how to be a good teacher: he gave clear lectures, detailed lecture notes, and extra office hours. Whenever I have questions and emailed him, he would reply within a day with very detail explanations (even with graphs!). Midterms were fair and easy and the final was long and hard (but it is open book, open notes, and you have a whole day to complete the exam).

I believe no professor else would be such cute to draw smiley faces in lecture notes and such kind to give more than one practice test before examinations. 32B is a very hard class, and Sangchul has made it much easier for me. Definitely choose him if possible!

Overall: 5
Easiness: 4
Workload: 5
Clarity: 5
Helpfulness: 5

Take everything you read here with a grain of salt.

This is probably the worst class I've taken at UCLA but it honestly was due to outside factors. Dr. Lee was pretty sick for most of the quarter so the class was definitely on the backburner- communication fell off the face of the earth and the class was pretty uninteractive. We were supposed to have quizzes for each lesson with a flipped classroom but we basically stopped having them after like week 6 or something and honestly they really helped me keep up with the content. Midterm 2 wasn't graded until the last day of grades being due (with no answer key uploaded) and the last homework assignment was abandoned. I also hate flipped classrooms and basically didn't attend live lectures for the last 5ish weeks as I felt they were pointless.

Overall though, tests were pretty fair, homework wasn't too hard, we had infinity attempts for quizzes and everything and he tried his best. At the end he said he even gave a light curve because the averages were a bit lower than expected (which is honestly unheard of for covid era 24hr tests ngl.) The lectures gave me enough information to succeed and even though I wish it were more engaging, I don't doubt that he'll be a better professor when he is at full strength.

his style, character, teaching ability, attitude towards students: cute◻️

Professor Lee is a very nice person. If you take his class, be prepared to spend a lot of time reading the textbook and trying to figure out the course material on your own.

As others have mentioned, Lee's prerecorded lecture videos were rather ineffective, mainly because he often uploads them only a couple hours before the live lecture. I have class during that time, so I had to watch the prerecorded video AFTER the live lecture- this defeats the purpose of having a flipped classroom with prerecorded videos. Lee's videos mainly consist him reading his notes word-for-word, so they weren't really helpful. His live lectures weren't much better; he struggled to answer students' questions and when he worked through some example problems, he rushed through them. I often had to consult the textbook or search online for answers to my questions since Lee's explanations were often vague and unclear.

His class also seems to be strangely disorganized. I understand Prof. Lee has been sick for most of the quarter, but the lack of organization is rather stunning. He started off by giving us prelecture quizzes and stopped doing so mid quarter (probably because he uploads prelecture videos late?). It takes him forever to grade midterms. For the second midterm, he said during Week 10 that the exam scores would be out "early this week." Reality: midterm 2 scores came back the day before the grade submission deadline (and after the final). It would have been nice to know our mistakes on midterm 2 so we can learn from them and not make the same mistakes on the final. On top of that, final course grades came out mere minutes before the submission deadline. This definitely heightened students' anxiety regarding their performance in this class.

Regarding exams, Prof. Lee's midterms definitely cannot be done in 1 hour as he claimed. There were 6 problems on midterm 2, with 3-5 parts on each problem. Midterm 2 took me 6-7 hours to complete, and there were reports of students taking over 12 hours to complete that midterm. The final was made more manageable though. His exams are fair in terms of difficulty.

This class gave me a lot of anxiety throughout the quarter, and even though I did well, I still feel my linear algebra foundation is very shaky. Prof. Lee tried his best; however, there are definitely ways he could have made this class a better learning experience.

Tests are hard and long, but the professor himself is sweet and very helpful, often having extra office hours before exams. In addition, he also posts his own notes online which have diagrams and are in color - they're absolutely lovely to look at, and he even includes smiley faces! 32B is hard no matter which professor you take, so you might as well take it with a professor who is deeply invested in student learning (and who gives chocolate during office hours!)

Sangchul is nice. Pretty nice. 32B is not an easy class, but Sangchul definitely knows how to make it appear easier for his students. I love him!

The math professor we all needed, but never truly deserved.

⬜️

okay professor

Sang Chul Lee is the best and sweetest and cutest human ever. Our entire class loved him. He's really young (he got his phd in the end of 2019). He knows how to teach well. His lectures are clear and coherent. They are structured exactly like the textbook. He has a fun energy and he draws smiley faces and pacman characters on the board. He genuinely cares about people. He says "aha!" when he uses sneaky clever methods to solve problems. It's all part of his infections enthusiasm.
The homework is very long and not easy. I am lucky I had enough friends in this class to make a study group because it's faster with everybody thinking at the same time. The tests are long and difficult too. But at the end, you'll feel like you understand the content pretty well.

Overall: 5
Easiness: 3
Workload: 1
Clarity: 5
Helpfulness: 5