Won Buddhism, also known as Wonbulgyo, is a modernized form of Korean Buddhism that was founded by Master Sotaesan in 1916. It is a unique blend of traditional Buddhist teachings and modern principles, making it a practical and relevant spiritual path for modern-day practitioners.

At its core, Won Buddhism emphasizes the concept of "Won," which means "circle" or "unity." This concept reflects the belief that all beings and phenomena in the universe are interconnected and interdependent. It also represents the ultimate goal of achieving harmony and balance within oneself and with the world.

The following are the core beliefs of Won Buddhism:

1. The Fourfold Grace: This is the fundamental principle of Won Buddhism, which encompasses the fourfold grace of nature, nurture, human effort, and harmony. Nature refers to the natural laws and order of the universe, nurture refers to the teachings and guidance of the Buddha, human effort refers to our own efforts and actions, and harmony refers to the balance and unity of all things.

2. The Threefold Practice: Won Buddhism emphasizes the importance of practice in achieving spiritual growth and enlightenment. The threefold practice consists of self-reflection, meditation, and good deeds. Self-reflection helps individuals to understand their true nature and overcome their ego, meditation helps to cultivate a calm and clear mind, and good deeds help to cultivate compassion and altruism.

3. The Fourfold Path: The Fourfold Path consists of the Four Noble Truths, which are the foundational teachings of Buddhism. These truths state that suffering exists, suffering has a cause, there is an end to suffering, and the path to end suffering is through the Eightfold Path.

4. The Eightfold Path: The Eightfold Path is the path to achieving enlightenment and liberation from suffering. It consists of eight aspects, including right understanding, right thought, right speech, right action, right livelihood, right effort, right mindfulness, and right concentration.

5. The Threefold Study: Won Buddhism also emphasizes the importance of studying and understanding the teachings of the Buddha. The threefold study consists of studying the scriptures, observing nature, and reflecting on one's own experiences.

In summary, the core beliefs of Won Buddhism revolve around the concept of unity, the importance of practice and study, and the Four Noble Truths and Eightfold Path. It is a practical and inclusive spiritual path that aims to help individuals achieve inner peace, harmony, and enlightenment in the modern world.