This is a short essay on the bottleneck of contemporary physics. It is argued that well-renowned open questions in various areas in physics all originate from the lack of understanding towards the dynamics in the vicinity of an interaction.

This is a comment on the thinking regarding a unified theory. It is argued that the simplicity and the applicability are not to be achieved simultaneously. So a possible unified theory can only be more complicated than any existing theories.

This is a record of my pursue of a final theory during my undergraduate time. It is explained how I gradually gave up the search for a final theory, or more precisely, how I uncovered the mysterious mask over the final theory.