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Woo Young Lee is interested in exploring the interplay between function theory and operator theory, with a specific focus on the invariant subspace problem. The invariant subspace problem is a simple question: “Does every bounded linear operator on a separable complex Hilbert space have a nontrivial invariant subspace?” This problem was fundamentally addressed by J. von Neumann in 1934. The problem is easy to state, however, it is still unsolved. This fascination takes Woo Young on a journey encompassing various fields, such as functional analysis, operator theory, complex analysis, harmonic analysis and etc. Of course, it is also an open question whether the invariant subspace problem and Woo Young’s journey to there are interesting.