In 2021, Yu's lecture on "The Psychology of Love" gained immense popularity, leading to its inclusion in the university's general elective courses.

It later evolved into "Positive Psychology", which covers a broader range of topics and has become one of the most sought-after electives at WHU. Even the largest lecture halls struggle to accommodate all the interested students.

"While traditional psychology focuses on addressing mental health issues, positive psychology aims to help people achieve happiness," Yu explained.

The Psychology of Love remains the most popular section of the course.

In these sessions, Yu encourages students to discuss their relationship challenges and uses psychological principles to help them understand the stages of intimate relationships — from initiation and growth to decline — and how to manage emotions when a relationship ends.

"I hope this course helps students approach life with a more positive mindset," Yu said. "Teachers present ideas and knowledge in ways that students both enjoy and find meaningful — that's what makes a great teaching method."