In his late writings, Dietrich Bonhoeffer defines humans as "Being for Others." His extensive engagement with Heidegger's "Being and Time" culminates in his "Ethics." In this study, Christian Schlenker explores their complex relationship, focusing on Bonhoeffer's critical engagement in areas like subjectivity, transcendence, freedom, and responsibility. Through meticulous analysis, it highlights the radically Christological nature of Bonhoeffer's ethics.