Supporting long-distance relationships (LDRs) is an important area of active research in HCI, focused on offering technological support for shared interaction over distances. Yet most current LDR research in HCI is westernized in focus, and eastern relationships remain under-investigated. We present an investigation of (South Korean) LDRs involving 14 participants (adult children only), finding that deliberately supporting disconnection could support LDRs in this context. We then designed and deployed ‘Silent Knock’ as an experimental prototype to explore how this principle might be realised in practical LDR settings, evaluating this with 22 participants (both the parents and their adult children) over a five-week deployment. We developed a rich understanding of LDRs within a South Korean context, and demonstrated a novel approach that effectively supports LDRs by respecting the value of disconnection. We also extend design spaces for LDRs based on the concept of slow design and minimalism, which underpinned our approach towards disconnection.